MERCK & CO INC
10-K/A, 1998-06-24
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 24, 1998
================================================================================
 
                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D. C. 20549
                                      
                              ------------------
                                      
                                 FORM 10-K/A
                                      
                     AMENDMENT TO FORM 10-K ANNUAL REPORT
                                      
                   Filed pursuant to Section 13 or 15(d) of
                                      
                     The Securities Exchange Act of 1934
                                      
                              ------------------
                                      
                              MERCK & CO., INC.
                                      
                                 P.O. BOX 100
                                      
                  WHITEHOUSE STATION, NEW JERSEY 08889-0100
 
================================================================================
<PAGE>   2
 
                                AMENDMENT NO. 1
 
     The undersigned registrant hereby amends the following items, financial
statements, exhibits or other portions of its annual report on Form 10-K for the
fiscal year ended December 31, 1997 as set forth below:
 
1.  Add Exhibit Numbers 99(a), 99(b), 99(c) and 99(d) as follows:
 
<TABLE>
<CAPTION>
EXHIBIT                                                             METHOD OF
NUMBER                  DESCRIPTION                                  FILING
<C>       <S>                                        <C>
 
99(a)     -- Financial statements and exhibits       Filed with this Form 10-K/A Amendment
             required by Form 11-K Annual Report
             pursuant to Section 15(d) of the
             Securities Exchange Act of 1934 for
             the Merck & Co., Inc. Employee
             Savings and Security Plan for the
             fiscal year ended December 31, 1997
 
99(b)     -- Financial statements and exhibits       Filed with this Form 10-K/A Amendment
             required by Form 11-K Annual Report
             pursuant to Section 15(d) of the
             Securities Exchange Act of 1934 for
             the Merck & Co., Inc. Employee Stock
             Purchase and Savings Plan for the
             fiscal year ended December 31, 1997
 
99(c)     -- Financial statements and exhibits       Filed with this Form 10-K/A Amendment
             required by Form 11-K Annual Report
             pursuant to Section 15(d) of the
             Securities Exchange Act of 1934 for
             the Hubbard Farms, Inc. Employee
             Savings Plan for the fiscal year
             ended December 31, 1997
 
99(d)     -- Financial statements and exhibits       Filed with this Form 10-K/A Amendment
             required by Form 11-K Annual Report
             pursuant to Section 15(d) of the
             Securities Exchange Act of 1934 for
             the Merck Puerto Rico Employee
             Savings and Security Plan for the
             period July 1, 1997 through Decem-
             ber 31, 1997
</TABLE>
 
                                        2
<PAGE>   3
 
                                   SIGNATURES
 
     PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS AMENDMENT TO BE SIGNED
ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.
 
                                          MERCK & CO., INC.
Dated:  June 22, 1998
                                        By  RAYMOND V. GILMARTIN
                                            (CHAIRMAN OF THE BOARD, PRESIDENT
                                            AND CHIEF EXECUTIVE OFFICER)
 
                                        By  /s/ CELIA A. COLBERT
                                                CELIA A. COLBERT
                                               (ATTORNEY-IN-FACT)
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS
AMENDMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS ON BEHALF OF THE
REGISTRANT AND IN THE CAPACITIES AND ON THE DATES INDICATED.
 
<TABLE>
<CAPTION>
                    SIGNATURES                                       TITLE                        DATE
                    ----------                                       -----                        ----
<C>                                                    <S>                                   <C>
 
               RAYMOND V. GILMARTIN                    Chairman of the Board,
                                                         President and Chief
                                                         Executive Officer ;
                                                         Principal Executive
                                                         Officer ; Director
 
                  JUDY C. LEWENT                       Senior Vice President
                                                         and Chief Financial
                                                         Officer; Principal
                                                         Financial Officer
 
                  PETER E. NUGENT                      Vice President, Controller ;
                                                         Principal Accounting
                                                         Officer
                   DEREK BIRKIN
                LAWRENCE A. BOSSIDY
                 WILLIAM G. BOWEN
                 JOHNNETTA B. COLE
                 CAROLYNE K. DAVIS                     Directors                             June 22, 1998    
                   LLOYD C. ELAM
                 WILLIAM N. KELLEY
                EDWARD M. SCOLNICK
                  SAMUEL O. THIER
</TABLE>
 
                                                    
 
     CELIA A. COLBERT, BY SIGNING HER NAME HERETO, DOES HEREBY SIGN THIS
DOCUMENT PURSUANT TO POWERS OF ATTORNEY DULY EXECUTED BY THE PERSONS NAMED,
FILED WITH THE SECURITIES AND EXCHANGE COMMISSION AS AN EXHIBIT TO FORM 10-K, ON
BEHALF OF SUCH PERSONS, ALL IN THE CAPACITIES AND ON THE DATE STATED, SUCH
PERSONS INCLUDING A MAJORITY OF THE DIRECTORS OF THE COMPANY.
 
                                                    By  /s/CELIA A. COLBERT
                                                           CELIA A. COLBERT
                                                          (ATTORNEY-IN-FACT)
 
                                        3

<PAGE>   1
 
                                                                   EXHIBIT 99(a)
 
                       FINANCIAL STATEMENTS AND EXHIBITS
                      REQUIRED BY FORM 11-K ANNUAL REPORT
        PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
                           COMMISSION FILE NO. 1-3305
 
                             ---------------------
 
              MERCK & CO., INC. EMPLOYEE SAVINGS AND SECURITY PLAN
                            (FULL TITLE OF THE PLAN)
 
                               MERCK & CO., INC.
                                  P.O. BOX 100
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
             (NAME OF ISSUER OF THE SECURITIES HELD PURSUANT TO THE
            PLAN AND THE ADDRESS OF ITS PRINCIPAL EXECUTIVE OFFICE)
<PAGE>   2
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Merck & Co., Inc.:
 
     We have audited the accompanying statements of net assets available for
benefits of the Merck & Co., Inc. Employee Savings and Security Plan (the
"Plan") as of December 31, 1997 and 1996, and the related statement of changes
in net assets available for benefits for the year ended December 31, 1997. These
financial statements and the schedules referred to below are the responsibility
of the Plan's management. Our responsibility is to express an opinion on these
financial statements and schedules based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the net assets available for benefits of the Plan as
of December 31, 1997 and 1996, and the changes in its net assets available for
benefits for the year ended December 31, 1997, in conformity with generally
accepted accounting principles.
 
     Our audits were performed for the purpose of forming an opinion on the
basic financial statements taken as a whole. The supplemental schedules of
assets held for investment purposes and reportable transactions are presented
for purposes of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure under
the Employee Retirement Income Security Act of 1974. The fund information in the
statements of net assets available for benefits and the statement of changes in
net assets available for benefits is presented for purposes of additional
analysis rather than to present the net assets available for plan benefits and
changes in net assets available for plan benefits of each fund. The supplemental
schedules and fund information have been subjected to the auditing procedures
applied in the audits of the basic financial statements and, in our opinion, are
fairly stated in all material respects in relation to the basic financial
statements taken as a whole.
 
                                                  ARTHUR ANDERSEN LLP
 
New York, New York
April 30, 1998
 
                                        1
<PAGE>   3
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
<TABLE>
<CAPTION>
                                                  MERCK COMMON STOCK FUND
                                             ----------------------------------
                                             (NON-PARTICIPANT     (PARTICIPANT     T. ROWE PRICE     FIDELITY
                                              DIRECTED; SEE      DIRECTED; SEE       BLUE CHIP       MAGELLAN
                                 TOTAL            NOTE 1)            NOTE 1)         GROWTH FUND        FUND
                                 -----        ----------------    -------------     -------------     --------
DECEMBER 31, 1997
- ---------------------------                                                        |--------------------------
<S>                          <C>                <C>               <C>               <C>             <C>
Assets:
  Investments at market 
    value..................  $2,134,239,587     $272,483,529      $1,104,221,533    $198,764,539    $         --
                             --------------     ------------      --------------    ------------    ------------
  Receivables
    Employer's 
      contribution.........       3,137,907        1,493,644             624,444         229,381              --
    Participants' 
       contributions.......       7,083,498               --           4,281,527         770,693              --
    Accrued interest and
      dividends............       6,147,371        1,168,119           4,787,193              --              --
                             --------------     ------------      --------------    ------------    ------------
      Total receivables....      16,368,776        2,661,763           9,693,164       1,000,074              --
                             --------------     ------------      --------------    ------------    ------------
Net assets available for
  benefits.................  $2,150,608,363     $275,145,292      $1,113,914,697    $199,764,613    $         --
                             ==============     ============      ==============    ============    ============
 
<CAPTION>
 
                               FIDELITY      VANGUARD
                                EQUITY-     U.S. GROWTH
                             INCOME FUND    PORTFOLIO
                             -----------   -----------
DECEMBER 31, 1997
- ---------------------------  --------------------------
<S>                          <C>           <C>
Assets:
  Investments at market 
    value..................  $44,321,055   $58,316,674
                             -----------   -----------
  Receivables
    Employer's 
      contribution.........       61,817       105,747
    Participants' 
      contributions........      171,851       226,118
    Accrued interest and
      dividends............           --            --
                             -----------   -----------
      Total receivables....      233,668       331,865
                             -----------   -----------
Net assets available for
  benefits.................  $44,554,723   $58,648,539
                             ===========   ===========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        2
<PAGE>   4
<TABLE>
<CAPTION>
                                                                                                         T. ROWE
                               FIDELITY       FIDELITY                                      FIDELITY      PRICE
                                GROWTH        GROWTH &      T. ROWE PRICE      FIDELITY    RETIREMENT    MID-CAP        FIDELITY 
                               COMPANY        INCOME        NEW INCOME      INTERMEDIATE     GROWTH       GROWTH           OTC   
                                 FUND         PORTFOLIO         FUND          BOND FUND       FUND         FUND         PORTFOLIO
                               --------       ---------     -------------    ------------   ---------    -------       ---------
DECEMBER 31, 1997                                            (PARTICIPANT DIRECTED; SEE NOTE 1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>            <C>             <C>             <C>             <C>           <C>             <C>
Assets:
  Investments at market 
    value.................. $        --    $98,415,031     $24,839,606     $        --     $       --    $38,576,112     $       --
                            -----------    -----------     -----------     -----------     ----------    -----------     ----------
  Receivables
    Employer's 
      contribution.........          --        156,268          33,889              --             --         74,682             --
    Participants' 
      contributions........          --        381,596          96,313              --             --        149,576             --
    Accrued interest and
      dividends............          --             --              --              --             --             --             -- 
                            -----------    -----------     -----------     -----------     ----------    -----------     ---------- 
      Total receivables....          --        537,864         130,202              --             --        224,258             -- 
                            -----------    -----------     -----------     -----------     ----------    -----------     ---------- 
Net assets available for
  benefits................  $        --    $98,952,895     $24,969,808     $        --     $       --    $38,800,370     $       -- 
                            ===========    ===========     ===========     ===========     ==========    ===========     ========== 

<CAPTION>
 
                                                                      THE GEORGE
                               EUROPACIFIC           FIDELITY           PUTNAM
                                  GROWTH             OVERSEAS           FUND OF
                                   FUND               FUND             BOSTON A
                                ----------          --------          ----------
DECEMBER 31, 1997                      (PARTICIPANT DIRECTED; SEE NOTE 1)
- --------------------------------------------------------------------------------
<S>                            <C>                 <C>               <C>
Assets:
  Investments at market 
    value..................    $31,038,262         $        --       $58,439,910
                               -----------         -----------       -----------
  Receivables
    Employer's 
      contribution.........         65,582                  --            58,051
    Participants' 
      contributions........        120,348                  --           226,596
    Accrued interest and
      dividends............             --                  --                --
                               -----------         -----------       -----------
      Total receivables....        185,930                  --           284,647
                               -----------         -----------       -----------
Net assets available for
  benefits................     $31,224,192         $        --       $58,724,557
                               ===========         ===========       ===========
</TABLE>
 
                                        3
<PAGE>   5
<TABLE>
<CAPTION>
                                              FIDELITY        FIDELITY        SPARTAN       FIDELITY    
                               FIDELITY      RETIREMENT      RETIREMENT     U.S. EQUITY    LOW-PRICED       FRANKLIN       PUTNAM 
                               BALANCED         MONEY        GOVERNMENT        INDEX          STOCK         SMALL CAP      VOYAGER
                                 FUND          MARKET       MONEY MARKET        FUND          FUND        GROWTH FUND I     FUND A
                               --------       ---------     -------------    ----------    ----------     -------------    ---------
DECEMBER 31, 1997             
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>            <C>            <C>             <C>            <C>             <C>             <C>
Assets:
  Investments at market 
    value.................. $        --    $86,580,252    $         --    $ 44,776,486   $11,112,462     $12,159,638     $ 5,696,444
                            -----------    -----------    ------------    ------------   -----------     -----------     -----------
  Receivables
    Employer's 
      contribution.........          --         75,937              --          75,937        20,083          23,848          15,690
    Participants' 
      contributions........          --        335,708              --         173,617        43,088          47,148          22,087
    Accrued interest and
      dividends............          --             --              --              --            --              --              --
                            -----------    -----------     -----------     -----------   -----------      ----------     -----------
      Total receivables....          --        411,645              --         249,554        63,171          70,996          37,777
                            -----------    -----------     -----------     -----------   -----------      ----------     -----------
Net assets available for
  benefits................  $        --    $86,991,897     $        --     $45,026,040   $11,175,633     $12,230,634     $ 5,734,221
                            ===========    ===========     ===========     ===========   ===========     ===========     ===========

<CAPTION>
                                TEMPLETON        
                               DEVELOPING          T. ROWE PRICE         PARTICIPANTS'   
                                 MARKETS              DIVIDEND               LOAN     
                                 TRUST I             GROWTH FUND           ACCOUNT   
                                ----------         -------------        -------------
DECEMBER 31, 1997                                                                    
- ------------------------------------------------------------------------------------|
<S>                            <C>                  <C>                  <C>
Assets:
  Investments at market 
    value..................    $ 4,713,493          $ 4,888,735          $34,895,826  
                               -----------          -----------          -----------  
  Receivables                                                                     
    Employer's                                                                    
      contribution.........         15,062                7,845                   --  
    Participants'                                                                 
      contributions........         18,276               18,956                   --  
    Accrued interest and                                                          
      dividends............             --                   --              192,059  
                               -----------          -----------          -----------          
      Total receivables....         33,338               26,801              192,059  
                               -----------          -----------          -----------  
Net assets available for                                                          
  benefits................     $ 4,746,831          $ 4,915,536          $35,087,885  
                               ===========          ===========          ===========  
</TABLE>

 
 
                                        4
<PAGE>   6
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
<TABLE>
<CAPTION>
                                                  MERCK COMMON STOCK FUND
                                               -----------------------------
                                                   (NON-                                       FIDELITY
                                                 PARTICIPANT    (PARTICIPANT      FIDELITY       EQUITY-
                                                DIRECTED; SEE   DIRECTED; SEE     MAGELLAN       INCOME
                                  TOTAL           NOTE 1)         NOTE 1)          FUND          FUND
                                  -----        -------------   -------------     --------      --------
DECEMBER 31, 1996
- -----------------------------                                                   |-------------------------
<S>                            <C>              <C>             <C>             <C>            <C>
Assets:
  Investments at market 
    value....................  $1,601,407,630   $203,684,246    $871,865,880    $145,105,856   $24,777,615  
                               --------------   ------------    ------------    ------------   -----------
  Receivables
    Employer's 
      contribution...........       2,625,228      1,286,362         520,058         200,830        46,992
    Participants' 
      contributions..........       5,866,877             --       3,755,053         621,829       106,181
    Accrued interest and 
       dividends.............       5,624,399      1,025,249       4,460,558              --            --
                               --------------   ------------    ------------    ------------   -----------
      Total receivables......      14,116,504      2,311,611       8,735,669         822,659       153,173
                               --------------   ------------    ------------    ------------   -----------
Net assets available for 
  benefits...................  $1,615,524,134   $205,995,857    $880,601,549    $145,928,515   $24,930,788
                               ==============   ============    ============    ============   ===========
 
<CAPTION>
                               FIDELITY      FIDELITY
                                GROWTH       GROWTH &
                               COMPANY        INCOME
                                 FUND        PORTFOLIO
                               --------      ---------
DECEMBER 31, 1996
- ---------------------------------------------------------
<S>                            <C>           <C>
Assets:
  Investments at market 
    value....................  $43,649,523   $62,317,069
                               -----------   -----------
  Receivables
    Employer's 
      contribution...........      101,859       129,949
    Participants' 
      contributions..........      187,053       267,050
    Accrued interest and 
      dividends..............           --            --
                               -----------   -----------
      Total receivables......      288,912       396,999
                               -----------   -----------
Net assets available for 
  benefits...................  $43,938,435   $62,714,068
                               ===========   ===========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        5
<PAGE>   7
<TABLE>
<CAPTION>                              
                                                 FIDELITY                                                    FIDELITY  
                                  FIDELITY      RETIREMENT      FIDELITY       FIDELITY       FIDELITY      RETIREMENT 
                                INTERMEDIATE      GROWTH           OTC         OVERSEAS       BALANCED         MONEY   
                                  BOND FUND        FUND         PORTFOLIO        FUND           FUND          MARKET   
                               ------------     ----------      ---------      --------       --------      ---------- 
DECEMBER 31, 1996                   (PARTICIPANT DIRECTED; SEE NOTE 1)                                     
- -------------------------------------------------------------------------------------------------------------------------
<S>                            <C>             <C>            <C>            <C>            <C>            <C>
Assets:
  Investments at market 
    value....................  $13,088,728     $13,878,448    $25,261,544    $22,079,860    $46,168,307    $37,299,452 
                               -----------     -----------    -----------    -----------    -----------    ----------- 
  Receivables                                                                                                          
    Employer's                                                                                                         
      contribution...........       26,252          34,390         63,005         50,667         52,242         27,827 
    Participants'                                                                                                      
      contributions..........       56,090          59,474        108,254         94,620        197,847        159,841 
    Accrued interest and                                                                                               
       dividends.............           --              --             --             --             --             -- 
                               -----------     -----------    -----------    -----------    -----------    ----------- 
      Total receivables......       82,342          93,864        171,259        145,287        250,089        187,668 
                               -----------     -----------    -----------    -----------    -----------    ----------- 
Net assets available for                                                                                               
  benefits...................  $13,171,070     $13,972,312    $25,432,803    $22,225,147    $46,418,396    $37,487,120 
                               ===========     ===========    ===========    ===========    ===========    =========== 

<CAPTION>
                                  FIDELITY                    
                                 RETIREMENT          FIDELITY                       
                                 GOVERNMENT        U.S. EQUITY        PARTICIPANTS' 
                                    MONEY            INDEX               LOAN      
                                   MARKET           PORTFOLIO            ACCOUNT    
                                 ----------       -----------        ------------- 
DECEMBER 31, 1996                                 
- ------------------------------------------------------------------------------------|
<S>                              <C>                <C>                 <C>   
Assets:                                                                                
  Investments at market                                                                
    value....................    $40,403,016        $18,771,886         $33,056,200 
                                 -----------        -----------         ----------- 
  Receivables                                                                          
    Employer's                                                                         
      contribution...........         37,541             47,254                  --  
    Participants'                                                                      
      contributions..........        173,141             80,444                  --  
    Accrued interest and                                                               
       dividends.............             --                 --             138,592  
                                 -----------        -----------         -----------  
      Total receivables......        210,682            127,698             138,592  
                                 -----------        -----------         -----------  
Net assets available for                                                                                         
  benefits...................    $40,613,698        $18,899,584         $33,194,792  
                                 ===========        ===========         ===========  

</TABLE>
                                                                      
                           6
  
<PAGE>   8
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
           STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
<TABLE>
<CAPTION>
                                                            MERCK COMMON STOCK FUND
                                                            -----------------------
                                                             (NON-
                                                          PARTICIPANT     (PARTICIPANT    T. ROWE PRICE     FIDELITY
                                                         DIRECTED; SEE   DIRECTED; SEE      BLUE CHIP       MAGELLAN
                                            TOTAL           NOTE 1)         NOTE 1)        GROWTH FUND        FUND
                                        --------------   -------------   -------------    -------------     --------
YEAR ENDED DECEMBER 31, 1997
- --------------------------------------                                                    |--------------------------
<S>                                     <C>              <C>             <C>              <C>             <C>
Additions to net assets attributed to:
  Investment income (loss)
    Net appreciation (depreciation) in
      market value of investments.....  $  450,286,858   $ 70,441,046    $  295,300,074   $ 16,134,723    $ 19,980,866
    Interest..........................       2,905,447        110,292         1,501,698        187,586         174,347
    Dividends.........................      58,062,327      5,502,302        23,044,546      1,144,065       3,868,673
                                        --------------   ------------    --------------   ------------    ------------
      Total investment income
        (loss)........................     511,254,632     76,053,640       319,846,318     17,466,374      24,023,886
                                        --------------   ------------    --------------   ------------    ------------
  Contributions to the Plan
    By participants...................     102,152,916             --        39,808,014      8,061,348       5,595,894
    By the employer...................      38,776,067     18,591,104         7,746,846      1,724,596       1,129,275
                                        --------------   ------------    --------------   ------------    ------------
      Total contributions.............     140,928,983     18,591,104        47,554,860      9,785,944       6,725,169
                                        --------------   ------------    --------------   ------------    ------------
      Total additions (deductions)....     652,183,615     94,644,744       367,401,178     27,252,318      30,749,055
                                        --------------   ------------    --------------   ------------    ------------
Deductions from net assets attributed
  to:
  Benefits paid to participants.......     (95,203,380)   (10,716,468)      (48,821,872)    (2,513,018)     (2,931,842)
                                        --------------   ------------    --------------   ------------    ------------
Transfers among funds and Plans:
  Transfers to Merck Puerto Rico
    Employee Savings and Security
    Plan..............................     (23,594,404)    (6,714,884)      (13,441,758)      (492,343)             --
  Net reallocations...................       1,698,398     (7,889,834)      (68,730,768)   175,737,505    (173,694,432)
  Loans to participants...............              --       (637,042)       (9,189,884)      (977,329)       (787,200)
  Loan repayments by participants.....              --        462,919         6,096,252        757,480         735,904
                                        --------------   ------------    --------------   ------------    ------------
      Net transfers among funds and
        Plans.........................     (21,896,006)   (14,778,841)      (85,266,158)   175,025,313    (173,745,728)
                                        --------------   ------------    --------------   ------------    ------------
      Total deductions and net
        transfers
        among funds and Plans.........    (117,099,386)   (25,495,309)     (134,088,030)   172,512,295    (176,677,570)
                                        --------------   ------------    --------------   ------------    ------------
        Net increase (decrease).......     535,084,229     69,149,435       233,313,148    199,764,613    (145,928,515)
Net assets available for benefits
        Beginning of year.............   1,615,524,134    205,995,857       880,601,549             --     145,928,515
                                        --------------   ------------    --------------   ------------    ------------
        End of year...................  $2,150,608,363   $275,145,292    $1,113,914,697   $199,764,613    $         --
                                        ==============   ============    ==============   ============    ============
 
<CAPTION>
 
                                         FIDELITY
                                          EQUITY-      VANGUARD
                                          INCOME      U.S. GROWTH
                                           FUND        PORTFOLIO
                                         --------     -----------
YEAR ENDED DECEMBER 31, 1997
- ------------------------------------------------------------------
<S>                                     <C>           <C>
Additions to net assets attributed to:
  Investment income (loss)
    Net appreciation (depreciation) in
      market value of investments.....  $ 6,793,507   $ 1,307,902
    Interest..........................       72,942        66,691
    Dividends.........................    2,298,777     2,254,386
                                        -----------   -----------
      Total investment income
        (loss)........................    9,165,226     3,628,979
                                        -----------   -----------
  Contributions to the Plan
    By participants...................    3,840,120     3,909,809
    By the employer...................      779,225       799,627
                                        -----------   -----------
      Total contributions.............    4,619,345     4,709,436
                                        -----------   -----------
      Total additions (deductions)....   13,784,571     8,338,415
                                        -----------   -----------
Deductions from net assets attributed
  to:
  Benefits paid to participants.......     (931,004)   (1,333,622)
                                        -----------   -----------
Transfers among funds and Plans:
  Transfers to Merck Puerto Rico
    Employee Savings and Security
    Plan..............................     (225,944)     (101,326)
  Net reallocations...................    7,040,405    51,771,200
  Loans to participants...............     (335,481)     (307,489)
  Loan repayments by participants.....      291,388       281,361
                                        -----------   -----------
      Net transfers among funds and
        Plans.........................    6,770,368    51,643,746
                                        -----------   -----------
      Total deductions and net
        transfers
        among funds and Plans.........    5,839,364    50,310,124
                                        -----------   -----------
        Net increase (decrease).......   19,623,935    58,648,539
Net assets available for benefits
        Beginning of year.............   24,930,788            --
                                        -----------   -----------
        End of year...................  $44,554,723   $58,648,539
                                        ===========   ===========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        7
<PAGE>   9
<TABLE>
<CAPTION>
                                         FIDELITY       FIDELITY                                                                    
                                          GROWTH        GROWTH &      T. ROWE PRICE      FIDELITY       FIDELITY      T. ROWE PRICE 
                                          COMPANY        INCOME        NEW INCOME      INTERMEDIATE    RETIREMENT        MID-CAP    
                                           FUND         PORTFOLIO         FUND          BOND FUND      GROWTH FUND     GROWTH FUND  
                                         --------       ---------     -------------    ------------    -----------    ------------- 
YEAR ENDED DECEMBER 31, 1997                 (PARTICIPANT DIRECTED; SEE NOTE 1)                                                 
- ------------------------------------    ------------------------------------------------------------------------------------------
<S>                                      <C>            <C>             <C>             <C>             <C>             <C>
Additions to net assets attributed to:
  Investment income (loss)
    Net appreciation (depreciation) in
      market value of investments.....   $ 5,767,886    $16,739,474     $   425,222     $   (47,266)    $ 1,843,361     $ 3,198,642 
    Interest..........................        68,133        181,751          14,934          12,737          20,454          40,702 
    Dividends.........................        75,503      4,283,405         729,230         450,796              --         398,290 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
      Total investment income                                                                                                     
        (loss)........................     5,911,522     21,204,630       1,169,386         416,267       1,863,815       3,637,634 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
  Contributions to the Plan              
    By participants...................     3,314,869     10,074,385       1,057,761         901,290       1,029,713       2,595,496 
    By the employer...................       608,556      2,024,431         238,192         154,807         193,189         545,943 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
      Total contributions.............     3,923,425     12,098,816       1,295,953       1,056,097       1,222,902       3,141,439 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
      Total additions (deductions)....     9,834,947     33,303,446       2,465,339       1,472,364       3,086,717       6,779,073 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
Deductions from net assets attributed    
  to:                                    
  Benefits paid to participants.......    (1,389,094)    (2,310,890)       (505,251)       (248,158)       (246,497)       (293,385)
                                         -----------    -----------     -----------     -----------     -----------     -----------
Transfers among funds and Plans:         
  Transfers to Merck Puerto Rico         
    Employee Savings and Security        
    Plan..............................            --       (209,311)         (9,761)             --              --        (107,238)
  Net reallocations...................   (52,435,493)     5,477,675      23,044,832     (14,386,911)    (16,818,627)     32,438,757
  Loans to participants...............      (223,029)      (831,802)        (98,537)        (59,781)        (80,417)       (205,440)
  Loan repayments by participants.....       274,234        809,709          73,186          51,416          86,512         188,603
                                         -----------    -----------      ----------     -----------     -----------     -----------
      Net transfers among funds and      
        Plans.........................   (52,384,288)     5,246,271      23,009,720     (14,395,276)    (16,812,532)     32,314,682
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
      Total deductions and net            
        transfers                         
        among funds and Plans.........   (53,773,382)     2,935,381      22,504,469     (14,643,434)    (17,059,029)     32,021,297 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
        Net increase (decrease).......   (43,938,435)    36,238,827      24,969,808     (13,171,070)    (13,972,312)     38,800,370 
Net assets available for benefits       
        Beginning of year.............    43,938,435     62,714,068              --      13,171,070      13,972,312              -- 
                                         -----------    -----------     -----------     -----------     -----------     ----------- 
        End of year...................   $        --    $98,952,895     $24,969,808     $        --     $        --     $38,800,370
                                         ===========    ===========     ===========     ===========     ===========     ===========
                                        
<CAPTION>
                                                                                          THE GEORGE          
                                                                            FIDELITY        PUTNAM            
                                       FIDELITY OTC    EUROPACIFIC          OVERSEAS        FUND OF           
                                         PORTFOLIO      GROWTH FUND           FUND         BOSTON A           
                                       ------------    -----------          --------      ----------          
YEAR ENDED DECEMBER 31, 1997                                             
- ------------------------------------------------------------------------------------------------------------  
<S>                                      <C>             <C>              <C>            <C>          
Additions to net assets attributed to:  
  Investment income (loss)              
    Net appreciation (depreciation) in  
      market value of investments.....   $ 1,751,822     $(3,450,830)     $ 4,079,755    $  (555,731)
    Interest..........................        43,494          39,657           32,789         53,640 
    Dividends.........................           153       1,608,164               --      4,478,936 
                                         -----------     -----------      -----------    ----------- 
      Total investment income                                              
        (loss)........................     1,795,469      (1,803,009)       4,112,544      3,976,845  
                                         -----------     -----------      -----------    -----------  
  Contributions to the Plan                                               
    By participants...................     2,278,556       2,247,100        1,734,085      2,075,492  
    By the employer...................       409,306         493,224          319,143        435,294  
                                         -----------     -----------      -----------    -----------  
      Total contributions.............     2,687,862       2,740,324        2,053,228      2,510,786  
                                         -----------     -----------      -----------    -----------  
      Total additions (deductions)....     4,483,331         937,315        6,165,772      6,487,631  
                                         -----------     -----------      -----------    -----------  
Deductions from net assets attributed                                     
  to:                                                                     
  Benefits paid to participants.......      (463,645)       (281,125)        (646,594)      (903,078) 
                                         -----------     -----------      -----------    -----------  
Transfers among funds and Plans:                                          
  Transfers to Merck Puerto Rico                                          
    Employee Savings and Security                                         
    Plan..............................            --         (86,596)              --       (121,190) 
  Net reallocations...................   (29,478,338)     30,630,152      (27,658,831)    53,246,173  
  Loans to participants...............      (148,441)       (167,095)        (204,986)      (200,454) 
  Loan repayments by participants.....       174,290         191,541          119,492        215,475  
                                         -----------     -----------      -----------    -----------  
      Net transfers among funds and                                       
        Plans.........................   (29,452,489)     30,568,002      (27,744,325)    53,140,004  
                                         -----------     -----------      -----------    -----------  
      Total deductions and net         
        transfers                      
        among funds and Plans.........   (29,916,134)     30,286,877      (28,390,919)    52,236,926  
                                         -----------     -----------      -----------    -----------  
        Net increase (decrease).......   (25,432,803)     31,224,192      (22,225,147)    58,724,557  
Net assets available for benefits                                     
        Beginning of year.............    25,432,803              --       22,225,147             --  
                                         -----------     -----------      -----------    -----------  
        End of year...................   $        --     $31,224,192      $        --    $58,724,557  
                                         ===========     ===========      ===========    ===========  
</TABLE>                                 




                                        8
<PAGE>   10
<TABLE>
<CAPTION>
                                       
                                                                         FIDELITY                                               
                                                          FIDELITY      RETIREMENT                                     FRANKLIN 
                                           FIDELITY      RETIREMENT     GOVERNMENT     SPARTAN U.S.     FIDELITY       SMALL CAP
                                           BALANCED         MONEY          MONEY       EQUITY INDEX    LOW-PRICED       GROWTH  
                                             FUND          MARKET         MARKET           FUND        STOCK FUND       FUND I  
                                           --------      ----------     ----------     ------------    ----------      ---------
YEAR ENDED DECEMBER 31, 1997           
- ----------------------------------------------------------------------------------------------------------------------------------- 
<S>                                       <C>            <C>            <C>            <C>             <C>            <C>
Additions to net assets attributed to: 
  Investment income (loss)             
    Net appreciation (depreciation) in 
      market value of investments.....    $ 5,254,443    $        --    $        --    $ 7,565,228     $      (286)   $  (519,762)
    Interest..........................         53,091         93,796         41,239         73,838           4,734          5,973 
    Dividends.........................        985,798      3,241,387      1,021,867        842,710         514,136        485,958 
                                          -----------    -----------    -----------    -----------     -----------    ----------- 
      Total investment income          
        (loss)........................      6,293,332      3,335,183      1,063,106      8,481,776         518,584        (27,831)
                                          -----------    -----------    -----------    -----------     -----------    ----------- 
  Contributions to the Plan            
    By participants...................      1,474,405      3,882,344      1,004,768      4,772,637         616,711        734,306
    By the employer...................        318,036        733,033        233,771        887,818          98,544        113,288
                                          -----------    -----------    -----------    -----------     -----------    -----------
      Total contributions.............      1,792,441      4,615,377      1,238,539      5,660,455         715,255        847,594
                                          -----------    -----------    -----------    -----------     -----------    -----------
      Total additions (deductions)....      8,085,773      7,950,560      2,301,645     14,142,231       1,233,839        819,763
                                          -----------    -----------    -----------    -----------     -----------    -----------
Deductions from net assets attributed     
  to:                                     
  Benefits paid to participants.......     (1,609,507)   (11,797,608)    (5,603,004)      (996,110)        (31,946)       (39,777)
                                          -----------    -----------    -----------    -----------     -----------    -----------
Transfers among funds and Plans:          
  Transfers to Merck Puerto Rico          
    Employee Savings and Security         
    Plan..............................             --       (305,070)            --        (40,069)             --             --
  Net reallocations...................    (52,891,711)    54,043,284    (37,337,706)    13,138,939       9,952,586     11,473,099
  Loans to participants...............       (203,971)      (756,375)      (210,351)      (434,576)        (16,363)       (54,995)
  Loan repayments by participants.....        201,020        369,986        235,718        316,041          37,517         32,544
                                          -----------    -----------    -----------    -----------     -----------    -----------
      Net transfers among funds and       
        Plans.........................    (52,894,662)    53,351,825    (37,312,339)    12,980,335       9,973,740     11,450,648
                                          -----------    -----------    -----------    -----------     -----------    -----------
      Total deductions and net            
        transfers                      
        among funds and Plans.........    (54,504,169)    41,554,217    (42,915,343)    11,984,225       9,941,794     11,410,871
                                          -----------    -----------    -----------    -----------     -----------    -----------
        Net increase (decrease).......    (46,418,396)    49,504,777    (40,613,698)    26,126,456      11,175,633     12,230,634
Net assets available for benefits      
        Beginning of year.............     46,418,396     37,487,120     40,613,698     18,899,584              --             --
                                          -----------    -----------    -----------    -----------     -----------    -----------
        End of year...................    $        --    $86,991,897    $        --    $45,026,040     $11,175,633    $12,230,634
                                          ===========    ===========    ===========    ===========     ===========    ===========
 
<CAPTION>
 
                                                          TEMPLETON    
                                            PUTNAM       DEVELOPING     T. ROWE PRICE    PARTICIPANTS'
                                            VOYAGER        MARKETS        DIVIDEND           LOAN     
                                            FUND A         TRUST I       GROWTH FUND        ACCOUNT   
                                            -------      ----------     -------------    -------------
YEAR ENDED DECEMBER 31, 1997                   
- -------------------------------------------------------------------------------------------------------        
<S>                                      <C>            <C>             <C>              <C>
Additions to net assets attributed to:   
  Investment income (loss)               
    Net appreciation (depreciation) in   
      market value of investments.....   $   (84,039)   $(1,787,482)    $  148,303       $        --
    Interest..........................         4,061          4,911          1,957                --
    Dividends.........................       341,199        308,391        183,655                --
                                         -----------    -----------     ----------       -----------
      Total investment income                                          
        (loss)........................       261,221     (1,474,180)       333,915                --
                                         -----------    -----------     ----------       -----------
  Contributions to the Plan                                            
    By participants...................       474,892        441,658        227,263                --
    By the employer...................        76,474         80,686         41,659                --
                                         -----------    -----------     ----------       -----------
      Total contributions.............       551,366        522,344        268,922                --
                                         -----------    -----------     ----------       -----------
      Total additions (deductions)....       812,587       (951,836)       602,837                --
                                         -----------    -----------     ----------       -----------
Deductions from net assets attributed                                   
  to:                                                                   
  Benefits paid to participants.......       (14,013)        (7,051)           (75)         (568,746)
                                         -----------    -----------     ----------       -----------
Transfers among funds and Plans:                                        
  Transfers to Merck Puerto Rico                                        
    Employee Savings and Security                                       
    Plan..............................            --             --             --        (1,738,914)
  Net reallocations...................     4,928,252      5,711,090      4,308,017            79,083
  Loans to participants...............       (10,386)       (23,456)        (1,969)       16,166,849
  Loan repayments by participants.....        17,781         18,084          6,726       (12,045,179)
                                         -----------    -----------     ----------       -----------
      Net transfers among funds and                                     
        Plans.........................     4,935,647      5,705,718      4,312,774         2,461,839
                                         -----------    -----------     ----------       -----------
      Total deductions and net           
        transfers                        
        among funds and Plans.........     4,921,634      5,698,667      4,312,699         1,893,093
                                         -----------    -----------     ----------       -----------
        Net increase (decrease).......     5,734,221      4,746,831      4,915,536         1,893,093
Net assets available for benefits        
        Beginning of year.............            --             --             --        33,194,792
                                         -----------    -----------     ----------       -----------
        End of year...................   $ 5,734,221    $ 4,746,831     $4,915,536       $35,087,885
                                         ===========    ===========     ==========       ===========
</TABLE>
 

                                        9
<PAGE>   11
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                         NOTES TO FINANCIAL STATEMENTS
 
 1. DESCRIPTION OF THE PLAN:
 
     The Merck & Co., Inc. Employee Savings and Security Plan (the "Plan") was
designed to provide an easy, economical way for employees to become stockholders
of Merck & Co., Inc. (the "Company" or "Merck") as well as a systematic means of
saving and investing for the future. Regular full-time, part-time, and temporary
employees of the Company and of certain wholly-owned subsidiaries as defined by
the Plan document who were not covered by a collective bargaining agreement are
eligible to enroll in the Plan as of the first day of the third month following
their date of hire.
 
     The Plan is administered by a management committee appointed by the Chief
Executive Officer of the Company. All costs of administering the Plan are borne
by the Company.
 
     Participants should refer to the Summary Plan Description for a complete
description of benefits provided.
 
     CONTRIBUTIONS
 
     Participants may contribute from 2% up to 15% of their base pay. In
addition, the Company matches 75% of employee contributions up to 6% of base pay
per pay period. Company matching contributions are invested according to the
following age parameters:
 
     Under age 50 -- 50% of Company matching contributions is invested in the
Merck Common Stock Fund (Non-participant directed) and 50% is invested in the
funds to which the participant is currently contributing (Participant directed).
 
     Age 50 and above -- Participants have the option to invest all Company
matching contributions in any of the available fund options (Participant
directed).
 
     INVESTMENT OPTIONS
 
     Participants direct the investment of their contributions into any
investment option including the Merck Common Stock Fund (Participant directed).
The following is a brief description of each option:
 
     Merck Common Stock Fund
 
     The Merck Common Stock Fund invests primarily in Merck common stock and a
small portion of money market instruments for liquidity. This liquidity allows
for daily trading in the fund. Ownership is measured in units rather than
shares. An investment in this option allows the participant to become a
stockholder and part owner of the Company. The value of the investment can go up
or down depending on general factors affecting the stock market and specific
factors affecting the Company's business. This is neither a mutual fund nor a
diversified or managed investment option. Investing in a non-diversified single
stock involves more investment risk than investing in a diversified fund.
 
     T. Rowe Price Blue Chip Growth Fund
 
     The T. Rowe Price Blue Chip Growth Fund seeks to provide long-term growth
of capital. The fund invests primarily (at least 65% of its assets) in common
stocks of large and medium-sized blue chip companies that have the potential for
above-average earnings growth and are well established in their respective
industries. The fund may also invest in convertible stocks and bonds, preferred
stocks, bonds and warrants. Up to 20% of assets (excluding reserves) may be
invested in foreign securities, which may be subject to currency risks and
political and sovereign risks of the home country.
 
     This investment option was added to the Plan effective July 1, 1997.
 
                                       10
<PAGE>   12
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Fidelity Magellan Fund
 
     Funds are invested primarily in domestic and foreign common stock and
securities convertible into common stock. Up to 20% of assets may also be
invested in debt securities of all types and qualities issued by foreign and
domestic issuers if the fund manager believes they have potential for capital
appreciation.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Equity-Income Fund
 
     Funds are invested in income-producing equity securities. Normally, at
least 65% of the fund's assets will be invested in income producing equity
securities. The fund has the flexibility to invest the balance in all types of
domestic and foreign securities, including bonds.
 
     Vanguard U.S. Growth Portfolio
 
     Vanguard U.S. Growth Portfolio seeks to provide long-term capital growth by
investing in equity securities of large, established U.S. companies that have
good growth records, strong market positions and have exhibited long-term
financial strength to provide potential long-term growth.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Growth Company Fund
 
     Funds are invested primarily in common stock, and securities convertible
into common stock, of companies considered to have above-average growth
characteristics. These characteristics are most often associated with companies
in new and emerging areas of the economy, although the fund may also hold shares
in larger, mature or declining industry firms which have been revitalized.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Growth & Income Portfolio
 
     Funds are invested primarily in U.S. and foreign stocks, focusing on those
that pay current dividends and offer potential growth of earnings such as common
stocks, convertible securities, preferred stocks and warrants.
 
     T. Rowe Price New Income Fund
 
     The T. Rowe Price New Income Fund is a bond fund that seeks to provide the
highest level of income consistent with preservation of capital by purchasing
securities that have been rated as investment-grade by Standard & Poor's,
Moody's or Fitch Investor Services. The fund invests at least 80% of its assets
in income-producing investment-grade debt securities including U.S. government
and agency securities, corporate bonds, bank obligations and utilities. The
fund's dollar-weighted average maturity is generally expected to be between four
and fifteen years.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Intermediate Bond Fund
 
     This fund seeks high current income by investing in U.S. and foreign
investment grade debt securities rated Baa or better by Moody's or BBB or better
by Standard & Poor's. Investment securities include
 
                                       11
<PAGE>   13
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
corporate bonds, mortgage securities, bank obligations and U.S. government and
agency securities, as well as short-term investments. The fund's dollar-weighted
average maturity will range between three and ten years under normal
circumstances.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Retirement Growth Fund
 
     Funds are invested primarily in common stocks of domestic or foreign
issuers, although they can be invested in all types of securities. Foreign
securities may involve a higher degree of risk. The fund's emphasis is on the
realization of capital gains rather than on dividend income.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     T. Rowe Price Mid-Cap Growth Fund
 
     T. Rowe Price Mid-Cap Growth Fund seeks to provide long-term capital
appreciation by investing primarily in the stock of medium-sized (mid-cap)
growth companies that offer the potential for above-average earnings growth. The
fund focuses on companies that are no longer considered new or emerging, but are
well-established. It may also invest in convertible securities, warrants and
foreign securities, which are subject to greater risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity OTC Portfolio
 
     Funds are invested primarily in securities traded on the over-the-counter
securities market. These are frequently the securities of smaller or newer
companies whose instruments may have limited marketability and may be subject to
more erratic market movement.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     EuroPacific Growth Fund
 
     This fund seeks long-term capital growth by investing primarily in
securities of companies outside the United States. Normally, at least 65% of the
fund's total assets will be invested in Europe or the Pacific Basin. The Pacific
Basin is generally defined as those countries bordering the Pacific Ocean and
includes, but is not limited to Australia, Canada, Japan, Malaysia and
Singapore. The fund may also invest in convertible securities, debt and
government securities and preferred stock. Foreign investments, especially in
developing countries, involve greater risks and may offer greater potential.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Overseas Fund
 
     This fund seeks long-term capital growth by investing primarily in foreign
securities. The investments may include common stock and securities convertible
into common stock, as well as debt instruments.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
                                       12
<PAGE>   14
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The George Putnam Fund of Boston A
 
     This fund seeks to provide a balanced investment comprised of a
well-diversified portfolio of stocks and bonds that will produce both capital
growth and current income. Normally, no more than 75% of the fund's assets will
be invested in common stocks and convertible securities.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Balanced Fund
 
     Funds are invested in a broadly diversified portfolio of high-yielding
securities, including common stocks, preferred stocks and bonds. The objective
is to provide a balanced investment in both stocks and bonds, thereby affording
the opportunity for capital growth and current income; however, at least 25% of
total assets will always be invested in fixed-income senior securities.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Retirement Money Market
 
     Funds are invested in high-quality U.S. dollar-denominated money market
instruments of U.S. and foreign issuers. Normally, the fund intends to invest
more than 25% of its total assets in obligations of institutions in the
financial services industry.
 
     Fidelity Retirement Government Money Market
 
     Funds are invested in obligations issued or guaranteed as to principal and
interest by the U.S. government, its agencies or instrumentalities, and in
repurchase agreements secured by these obligations. An investment in the
portfolio is not insured or guaranteed by the U.S. government.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Spartan U.S. Equity Index Fund
 
     Funds are primarily invested in securities of the companies which comprise
the S&P 500 Index. Effective April 18, 1997, the fund name was changed from
Fidelity U.S. Equity Index Portfolio to the Spartan U.S. Equity Index Fund.
 
     Fidelity Low-Priced Stock Fund
 
     This fund seeks capital appreciation by investing mainly in low-priced
domestic and foreign common stocks ($35 or less at time of purchase). Foreign
securities may involve a higher degree of risk. This fund charges a redemption
fee to discourage short-term buying and selling of fund shares. If fund shares
are sold after being held for less than 90 days, the fund will deduct a
redemption fee from participants' accounts equal to 1.5% of the value of the
shares sold.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Franklin Small Cap Growth Fund I
 
     This fund seeks long-term capital growth by investing primarily in stocks
of companies with market capitalization of less than $1 billion at the time of
the investment. The fund tries to invest at least one-third of its assets in
stocks of companies with market capitalization of $550 million or less. Although
the fund's assets
 
                                       13
<PAGE>   15
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
are invested primarily in small companies, it may invest up to 35% of its total
assets in larger capitalized companies with strong growth potential, in
relatively well-known larger companies in mature industries with potential for
capital appreciation, or in corporate debt securities, including bonds, notes
and debentures if deemed appropriate. The fund may also invest up to 25% of its
total assets in foreign securities, which may involve greater risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Putnam Voyager Fund A
 
     This fund seeks capital appreciation by investing primarily in common
stocks of companies that have potential for capital appreciation which is
significantly greater than that of the market averages. The fund may also invest
in convertible bonds, convertible preferred stocks, warrants, preferred stocks,
money market instruments and debt securities. The fund may invest up to 20% of
its total assets in securities principally traded in foreign markets. Foreign
securities are subject to currency, political, financial or sovereign risks of
the issuer's home country.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Templeton Developing Markets Trust I
 
     This fund seeks long-term capitalization by investing in equity securities
of emerging market countries. The fund may invest up to 35% of its total assets
in debt securities, including bonds, notes, debentures, commercial paper,
certificates of deposit, time deposits and bankers' acceptances. Foreign
investments may involve greater risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     T. Rowe Price Dividend Growth Fund
 
     This fund seeks to provide increasing dividend income over time, long-term
capital appreciation and reasonable current income through investments primarily
in dividend-paying stocks. The fund may also invest in bonds and foreign
securities.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     VESTING
 
     Participants are immediately vested in their contributions, all Company
matching contributions, plus actual earnings thereon.
 
     PLAN TERMINATION
 
     Although it has not expressed any intent to do so, the Company has the
right under the Plan to discontinue its contributions at any time and to
terminate the Plan subject to the provisions of the Employee Retirement Income
Security Act of 1974.
 
     PARTICIPANTS' LOAN ACCOUNT
 
     Participants may borrow from their account balances with interest charged
at the prime rate plus 1%. Loan terms range from one to five years or up to
thirty years for the purchase of a primary residence. The minimum loan is $500
and the maximum loan is the lesser of $50,000 less the highest outstanding loan
                                       14
<PAGE>   16
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
balance during the one year period prior to the new loan application date, or
50% of the participant's account balance less any current outstanding loan.
Activity related to these borrowings is reflected in the Participants' Loan
Account column of the financial statements.
 
     BENEFITS PAID TO PARTICIPANTS
 
     In-service (which include hardship withdrawals) and termination
distributions are made throughout the year in accordance with applicable Plan
provisions. At December 31, 1997 and 1996, net assets available for benefits
included distributions in process of payment of $3,134,986 and $2,827,505,
respectively.
 
 2. SUMMARY OF ACCOUNTING POLICIES:
 
     The financial statements of the Plan have been prepared on the accrual
basis of accounting. The investments of the Plan are stated at quoted market
value. Dividend income is recorded on the ex-dividend date. The net appreciation
(depreciation) in market value of investments is based on the beginning of the
year market value or value at the time of purchase during the year and is
included in the statement of changes in net assets available for benefits.
 
     USE OF ESTIMATES
 
     The financial statements are prepared in conformity with generally accepted
accounting principles and, accordingly, include amounts that are based on
management's best estimates and judgments. Actual results could differ from
these estimates.
 
     RECLASSIFICATIONS
 
     Certain prior year amounts shown in the accompanying financial statements
have been reclassified to conform to the current year's presentation.
 
 3.  INCOME TAXES:
 
     The Plan obtained a tax determination letter from the Internal Revenue
Service on September 18, 1995 indicating that it had been designed in accordance
with applicable sections of the Internal Revenue Code ("IRC"). The Plan was most
recently amended in July 1997. The Plan sponsor believes that the Plan is
designed and currently operated in compliance with the IRC.
 
 4.  OTHER MATTERS:
 
     A transfer of ($23,594,404) was made on July 1, 1997 for employees residing
in Puerto Rico who were transferred to a new plan, the Merck Puerto Rico
Employee Savings and Security Plan.
 
     Net reallocations and transfers in 1997 of $1,698,398 consist of $1,467,531
transferred between the Plan and the Merck & Co., Inc. Stock Purchase and
Savings Plan for employees who changed their status during the year and $424,912
transferred in from Merck-Medco Managed Care, L.L.C. during the year. The
remaining amount relates to miscellaneous net transfers.
 
 5.  PARTY-IN-INTEREST:
 
     All transactions of party-in-interest are set forth on the attached
schedule.
 
 6.  SUBSEQUENT EVENTS:
 
     Effective January 6, 1998, Merck employees in the Merck AgVet division and
associated operations and their balances in the Plan were transferred to the
savings plan of Merial Limited, a stand-alone joint venture that is 50% owned by
Merck & Co., Inc. and 50% owned by Rhone-Poulenc SA.
 
                                       15
<PAGE>   17
 
                                                           SCHEDULE I
                                                           EIN:  22-1109110
                                                           PLAN NO.:  001
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
          ITEM 27a -- SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
 
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                NUMBER OF
                                                             UNITS/SHARES AT
             NAME OF ISSUER AND TITLE OF ISSUE               CLOSE OF PERIOD         COST         CURRENT VALUE
             ---------------------------------               ---------------    --------------    -------------
<S>                                                          <C>                <C>               <C>
Merck Common Stock Fund*....................................   75,769,964       $  481,662,364    $1,376,705,062
T. Rowe Price Blue Chip Growth Fund.........................    8,223,605          183,262,013       198,764,539
Fidelity Equity-Income Fund.................................      845,675           35,585,777        44,321,055
Vanguard U.S. Growth Portfolio..............................    2,031,940           57,240,807        58,316,674
Fidelity Growth & Income Portfolio..........................    2,583,111           74,922,676        98,415,031
T. Rowe Price New Income Fund...............................    2,738,655           24,446,790        24,839,606
T. Rowe Price Mid-Cap Growth Fund...........................    1,348,815           35,570,891        38,576,112
EuroPacific Growth Fund.....................................    1,192,862           34,340,119        31,038,262
The George Putnam Fund of Boston A..........................    3,250,273           59,079,694        58,439,910
Fidelity Retirement Money Market............................   86,552,102           86,552,102        86,580,252
Spartan U.S. Equity Index Fund..............................    1,280,064           35,002,228        44,776,486
Fidelity Low-Priced Stock Fund..............................      442,199           11,113,049        11,112,462
Franklin Small Cap Growth Fund I............................      530,294           12,684,386        12,159,638
Putnam Voyager Fund A.......................................      299,026            5,772,063         5,696,444
Templeton Developing Markets Trust I........................      364,257            6,412,885         4,713,493
T. Rowe Price Dividend Growth Fund..........................      242,858            4,745,064         4,888,735
Participants' Loan Account (with interest ranging from 6.5%
  to 12.5%).................................................      --                34,895,826        34,895,826
                                                                                --------------    --------------
        Total Investments...................................                    $1,183,288,734    $2,134,239,587
                                                                                ==============    ==============
</TABLE>
 
- ---------------
 
* Denotes a party-in-interest to the Plan.
 
                                       16
<PAGE>   18
 
                                                           SCHEDULE II
                                                           EIN:  22-1109110
                                                           PLAN NO.:  001
 
                               MERCK & CO., INC.
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
               ITEM 27d -- SCHEDULE OF REPORTABLE TRANSACTIONS(a)
 
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                                                    CURRENT
                                                                                                     VALUE
                                                                                                  OF ASSETS ON
IDENTITY OF PARTY INVOLVED AND DESCRIPTION OF      PURCHASE                         COST OF       TRANSACTION
ASSETS                                              PRICE        SELLING PRICE       ASSET            DATE          NET GAIN
- ---------------------------------------------    ------------    -------------    ------------    ------------    ------------
<S>                                              <C>             <C>              <C>             <C>             <C>
Merck Common Stock Fund
   251 Purchase Transactions..............       $190,659,284    $         --     $190,659,284    $190,659,284    $         --
   251 Sales Transactions.................                 --     260,659,275      133,791,678     260,659,275     126,867,597
T. Rowe Price Blue Chip Growth Fund
   128 Purchase Transactions..............        198,222,455              --      198,222,455     198,222,455              --
   125 Sales Transactions.................                 --      15,592,642       14,960,443      15,592,642         632,199
Fidelity Magellan Fund
   130 Purchase Transactions..............         13,963,042              --       13,963,042      13,963,042              --
   126 Sales Transactions.................                 --     179,059,139      140,905,074     179,059,139      38,154,065
Fidelity Retirement Money Market Portfolio
   254 Purchase Transactions..............        154,014,032              --      154,014,032     154,014,032              --
   249 Sales Transactions.................                 --     104,733,231      104,733,231     104,733,231              --
</TABLE>
 
- ---------------
(a) Reportable transactions are transactions that, individually or in the
    aggregate, exceed 5% of the Plan's net assets as of the beginning of the
    Plan year.
 
                                       17
<PAGE>   19
 
                                                                      EXHIBIT 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference of our report dated April 30, 1998 included in the financial
statements and exhibits required by Form 11-K Annual Report for the Merck & Co.,
Inc. Employee Savings and Security Plan into the Company's previously filed
Registration Statements on Form S-8 (Nos. 33-21087, 33-21088, 33-36101,
33-40177, 33-51235, 33-53463, 33-64273, 33-64665, 333-23293 and 333-23295), on
Form S-4 (No. 33-50667) and on Form S-3 (Nos. 33-60322, 33-39349, 33-51785,
33-57421, 333-17045 and 333-36383). It should be noted that we have not audited
any financial statements of the Plan subsequent to December 31, 1997 or
performed any audit procedures subsequent to the date of our report.
 
                                            ARTHUR ANDERSEN LLP
 
New York, New York
June 22, 1998

<PAGE>   1
 
                                                                   EXHIBIT 99(b)
 
                       FINANCIAL STATEMENTS AND EXHIBITS
                      REQUIRED BY FORM 11-K ANNUAL REPORT
        PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
                           COMMISSION FILE NO. 1-3305
 
                             ---------------------
 
           MERCK & CO., INC. EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
                            (Full title of the plan)
 
                               MERCK & CO., INC.
                                  P.O. BOX 100
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
             (Name of issuer of the securities held pursuant to the
            plan and the address of its principal executive office)
<PAGE>   2
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Merck & Co., Inc.:
 
     We have audited the accompanying statements of net assets available for
benefits of the Merck & Co., Inc. Employee Stock Purchase and Savings Plan (the
"Plan") as of December 31, 1997 and 1996, and the related statement of changes
in net assets available for benefits for the year ended December 31, 1997. These
financial statements and the schedules referred to below are the responsibility
of the Plan's management. Our responsibility is to express an opinion on these
financial statements and schedules based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the net assets available for benefits of the Plan as
of December 31, 1997 and 1996, and the changes in its net assets available for
benefits for the year ended December 31, 1997, in conformity with generally
accepted accounting principles.
 
     Our audits were performed for the purpose of forming an opinion on the
basic financial statements taken as a whole. The supplemental schedules of
assets held for investment purposes and reportable transactions are presented
for purposes of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure under
the Employee Retirement Income Security Act of 1974. The fund information in the
statements of net assets available for benefits and the statement of changes in
net assets available for benefits is presented for purposes of additional
analysis rather than to present the net assets available for plan benefits and
changes in net assets available for plan benefits of each fund. The supplemental
schedules and fund information have been subjected to the auditing procedures
applied in the audits of the basic financial statements and, in our opinion, are
fairly stated in all material respects in relation to the basic financial
statements taken as a whole.
 
                                          ARTHUR ANDERSEN LLP
 
New York, New York
April 30, 1998
 
                                        1
<PAGE>   3
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                              MERCK COMMON STOCK FUND
                                                           -----------------------------
                                                               (NON-                         T. ROWE                    FIDELITY
                                                            PARTICIPANT    (PARTICIPANT       PRICE       FIDELITY      EQUITY-
                                                           DIRECTED; SEE   DIRECTED; SEE    BLUE CHIP     MAGELLAN       INCOME
                                               TOTAL          NOTE 1)         NOTE 1)      GROWTH FUND      FUND          FUND
                                               -----       -------------   -------------   -----------    --------      --------
DECEMBER 31, 1997
- ------------------------------------------                                                 |-------------------------------------
<S>                                         <C>            <C>             <C>             <C>           <C>           <C>
Assets:
  Investments at market value.............  $269,920,909    $49,466,644    $173,227,643    $11,198,335   $        --   $1,895,866
                                            ------------    -----------    ------------    -----------   -----------   ----------
  Receivables
    Employer's contribution...............        77,521         77,521              --             --            --           --
    Participants' contributions...........       360,190             --         292,723         18,923            --        3,204
    Accrued interest and dividends........       962,735        211,323         735,968             --            --           --
                                            ------------    -----------    ------------    -----------   -----------   ----------
      Total receivables...................     1,400,446        288,844       1,028,691         18,923            --        3,204
                                            ------------    -----------    ------------    -----------   -----------   ----------
Net assets available for benefits.........  $271,321,355    $49,755,488    $174,256,334    $11,217,258   $        --   $1,899,070
                                            ============    ===========    ============    ===========   ===========   ==========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        2
<PAGE>   4
<TABLE>
<CAPTION>
                                                          FIDELITY     FIDELITY                                       FIDELITY  
                                            VANGUARD       GROWTH      GROWTH &     T. ROWE PRICE      FIDELITY      RETIREMENT 
                                           U.S. GROWTH    COMPANY       INCOME       NEW INCOME      INTERMEDIATE      GROWTH   
                                            PORTFOLIO       FUND      PORTFOLIO         FUND          BOND FUND         FUND    
                                           -----------    --------    ---------     -------------    ------------    ---------- 
DECEMBER 31, 1997                                                     (PARTICIPANT DIRECTED; SEE NOTE 1)                  
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>            <C>         <C>             <C>              <C>            <C>       
Assets:                                                                                                                        
  Investments at market value............. $2,006,198     $    --     $3,664,353      $966,177         $     --       $     -- 
                                           ----------     --------    ----------      --------         --------       -------- 
  Receivables                                                                                                                  
    Employer's contribution...............         --           --            --            --               --             -- 
    Participants' contributions...........      3,390           --         6,192         1,633               --             -- 
    Accrued interest and dividends........         --           --            --            --               --             -- 
                                           ----------     --------    ----------      --------         --------       -------- 
      Total receivables...................      3,390           --         6,192         1,633               --             -- 
                                           ----------     --------    ----------      --------         --------       -------- 
Net assets available for benefits......... $2,009,588     $     --    $3,670,545      $967,810         $     --       $     -- 
                                           ==========     ========    ==========      ========         ========       ======== 



<CAPTION>
                                            T. ROWE PRICE     FIDELITY                    FIDELITY
                                               MID-CAP           OTC       EUROPACIFIC    OVERSEAS
                                             GROWTH FUND      PORTFOLIO    GROWTH FUND      FUND  
                                            -------------     ---------    -----------    --------
DECEMBER 31, 1997                                      (PARTICIPANT DIRECTED; SEE NOTE 1)         
- --------------------------------------------------------------------------------------------------
<S>                                          <C>              <C>          <C>            <C>     
Assets:                                       $1,591,041      $     --     $1,349,190     $     --
  Investments at market value.............    ----------      --------     ----------     --------
                                                                                                  
  Receivables                                         --            --             --           --
    Employer's contribution...............         2,689            --          2,280           --
    Participants' contributions...........            --            --             --           --
    Accrued interest and dividends........    ----------      --------     ----------     --------
                                                   2,689            --          2,280           --
      Total receivables...................    ----------      --------     ----------     --------
                                              $1,593,730      $     --     $1,351,470     $     --
Net assets available for benefits.........    ==========      ========     ==========     ========
                                         

</TABLE>


                                       3
<PAGE>   5
<TABLE>
<CAPTION>
                                           THE GEORGE                 FIDELITY       FIDELITY                                  
                                             PUTNAM      FIDELITY    RETIREMENT     RETIREMENT       SPARTAN       FIDELITY    
                                            FUND OF      BALANCED      MONEY        GOVERNMENT     U.S. EQUITY    LOW-PRICED   
                                            BOSTON A       FUND        MARKET      MONEY MARKET    INDEX FUND     STOCK FUND   
                                           ----------    --------    ----------    ------------    -----------    ----------   
DECEMBER 31, 1997                        
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>           <C>         <C>             <C>           <C>             <C>       
Assets:                                                                                                                        
  Investments at market value............. $4,889,792    $     --    $9,317,599      $     --      $1,076,594      $460,669  
                                           ----------    --------    ----------      --------      ----------      --------  
  Receivables                              
    Employer's contribution...............         --          --            --            --              --            --  
    Participants' contributions...........      8,263          --        15,745            --           1,819           778  
    Accrued interest and dividends........         --          --            --            --              --            --  
                                           ----------    --------    ----------      --------      ----------      --------  
      Total receivables...................      8,263          --        15,745            --           1,819           778  
                                           ----------    --------    ----------      --------      ----------      --------  
Net assets available for benefits......... $4,898,055    $     --    $9,333,344      $     --      $1,078,413      $461,447  
                                           ==========    ========    ==========      ========      ==========      ========  
                                           
<CAPTION>
                                                                     TEMPLETON                                     
                                          FRANKLIN         PUTNAM     DEVELOPING    T. ROWE PRICE                 
                                          SMALL CAP       VOYAGER      MARKETS         DIVIDEND       PARTICIPANTS'
                                        GROWTH FUND I      FUND A      TRUST I        GROWTH FUND     LOAN ACCOUNT 
                                        -------------     -------     ----------    -------------    -------------
DECEMBER 31, 1997                                                
- ------------------------------------------------------------------------------------------------------------------|
<S>                                        <C>            <C>          <C>             <C>             <C>        
Assets:                                                                                                          
  Investments at market value............. $492,967       $463,264     $250,691        $302,591        $7,301,295
                                           --------       --------     --------        --------        ----------
  Receivables                                                                                                    
    Employer's contribution...............       --             --           --              --                --
    Participants' contributions...........      833            783          424             511                --
    Accrued interest and dividends........       --             --           --              --            15,444
                                           --------       --------     --------        --------        ----------
      Total receivables...................      833            783          424             511            15,444
                                           --------       --------     --------        --------        ----------
Net assets available for benefits......... $493,800       $464,047     $251,115        $303,102        $7,316,739
                                           ========       ========     ========        ========        ==========
                                                                                    
</TABLE>
 
                                        4


                




<PAGE>   6
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                     MERCK COMMON STOCK FUND  
                                                  -----------------------------
                                                      (NON-                                    FIDELITY    FIDELITY     FIDELITY
                                                   PARTICIPANT    (PARTICIPANT     FIDELITY    EQUITY-      GROWTH      GROWTH &
                                                  DIRECTED; SEE   DIRECTED; SEE    MAGELLAN     INCOME     COMPANY       INCOME
                                      TOTAL          NOTE 1)         NOTE 1)         FUND        FUND        FUND      PORTFOLIO
                                      -----       -------------   -------------    --------    --------    --------    ---------
DECEMBER 31, 1996                                                                    
- ---------------------------------                                                 |----------------------------------------------
<S>                                <C>             <C>            <C>             <C>          <C>        <C>          <C>
Assets:
  Investments at market value....  $199,786,764    $46,804,486    $121,471,143    $7,849,145   $915,537   $1,008,987   $1,986,353
                                   ------------    -----------    ------------    ----------   --------   ----------   ----------
  Receivables
    Employer's contribution......        61,525         61,525              --            --         --           --           --
    Participants'
      contributions..............       312,196             --         260,255        16,059      1,873        2,064        4,064
    Accrued interest and
      dividends..................       866,527        235,591         625,250            --         --           --           --
                                   ------------    -----------    ------------    ----------   --------   ----------   ----------
      Total receivables..........     1,240,248        297,116         885,505        16,059      1,873        2,064        4,064
                                   ------------    -----------    ------------    ----------   --------   ----------   ----------
Net assets available for
  benefits.......................  $201,027,012    $47,101,602    $122,356,648    $7,865,204   $917,410   $1,011,051   $1,990,417
                                   ============    ===========    ============    ==========   ========   ==========   ==========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        5
<PAGE>   7
 
<TABLE>
<CAPTION>

                                                                                                                    
                                                   FIDELITY                                             
                                    FIDELITY      RETIREMENT    FIDELITY     FIDELITY     FIDELITY      
                                  INTERMEDIATE      GROWTH         OTC       OVERSEAS     BALANCED      
                                   BOND FUND         FUND       PORTFOLIO      FUND         FUND        
                                  ------------    ----------    ---------    --------     --------      
DECEMBER 31, 1996                    (PARTICIPANT DIRECTED; SEE NOTE 1)            
- --------------------------------  -----------------------------------------------------------------
<S>                                 <C>            <C>          <C>          <C>         <C>
Assets:
  Investments at market value...    $369,411       $616,783     $719,063     $800,300    $3,807,066     
                                    --------       --------     --------     --------    ----------     
  Receivables                                                                                           
    Employer's contribution.....          --             --           --           --            --     
    Participants'                                                                                       
      contributions.............         756          1,262        1,471        1,637         7,789     
    Accrued interest and                                                                                
      dividends.................          --             --           --           --            --     
                                    --------       --------     --------     --------    ----------     
      Total receivables.........         756          1,262        1,471        1,637         7,789     
                                    --------       --------     --------     --------    ----------     
Net assets available for                                                                                
  benefits......................    $370,167       $618,045     $720,534     $801,937    $3,814,855     
                                    ========       ========     ========     ========    ==========     

</TABLE>

<TABLE>
<CAPTION>                                

                                                   FIDELITY                                
                                     FIDELITY     RETIREMENT    FIDELITY                 
                                    RETIREMENT    GOVERNMENT   U.S. EQUITY  PARTICIPANTS'
                                       MONEY         MONEY        INDEX         LOAN   
                                      MARKET        MARKET      PORTFOLIO      ACCOUNT 
                                    ----------    ----------   -----------  -------------
DECEMBER 31, 1996                    
- --------------------------------  ------------------------------------------------------|
<S>                                 <C>            <C>          <C>        <C>        
Assets:                                                                                      
  Investments at market value...    $2,210,381     $4,596,289   $508,094   $6,123,726
                                    ----------     ----------   --------   ----------
  Receivables                                                                                
    Employer's contribution.....            --             --         --           --
    Participants'                                                                            
      contributions.............         4,522          9,404      1,040           --
    Accrued interest and                                                                     
      dividends.................            --             --         --        5,686
                                    ----------     ----------   --------   ----------
      Total receivables.........         4,522          9,404      1,040        5,686
                                    ----------     ----------   --------   ----------
Net assets available for                                                                     
  benefits......................    $2,214,903     $4,605,693   $509,134   $6,129,412
                                    ==========     ==========   ========   ==========
</TABLE>

                                       6
<PAGE>   8
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
           STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                               MERCK COMMON STOCK FUND
                                            -----------------------------
                                                (NON-                                                     FIDELITY
                                             PARTICIPANT    (PARTICIPANT    T. ROWE PRICE    FIDELITY     EQUITY-      VANGUARD
                                            DIRECTED; SEE   DIRECTED; SEE     BLUE CHIP      MAGELLAN      INCOME     U.S. GROWTH
                                TOTAL          NOTE 1)         NOTE 1)       GROWTH FUND       FUND         FUND       PORTFOLIO
                                -----       -------------   -------------   -------------    --------     --------    -----------
YEAR ENDED DECEMBER 31,
1997
- ---------------------------                                                 -----------------------------------------------
<S>                          <C>            <C>             <C>             <C>             <C>          <C>          <C>
Additions to net assets
  attributed to:
  Investment income
    Net appreciation
      (depreciation) in
      market value of
      investments..........  $ 60,311,739    $ 7,000,059    $ 49,591,267     $   888,938    $1,094,692   $  258,998   $   28,410
    Interest...............       561,933         88,898         364,353          18,921        14,672        3,111        3,925
    Dividends..............     6,189,451      1,143,617       3,368,327          64,978       213,308       95,903       76,779
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
      Total investment
        income (loss)......    67,063,123      8,232,574      53,323,947         972,837     1,322,672      358,012      109,114
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
  Contributions to the Plan
    By participants........    14,731,915             --      10,195,564         679,729       499,515      269,830      219,271
    By the employer........     2,164,962      2,164,962              --              --            --           --           --
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
      Total
        contributions......    16,896,877      2,164,962      10,195,564         679,729       499,515      269,830      219,271
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
      Total additions......    83,960,000     10,397,536      63,519,511       1,652,566     1,822,187      627,842      328,385
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
Deductions from net assets
  attributed to:
  Benefits paid to
    participants...........   (12,198,126)    (2,634,769)     (7,996,619)        (57,577)     (102,370)     (71,445)      (5,265)
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
Transfers among funds and
  Plans:
  Net reallocations........    (1,467,531)    (5,072,674)     (2,459,862)      9,642,854    (9,547,138)     435,010    1,688,623
  Loans to participants....            --       (387,924)     (2,619,047)        (91,132)      (91,885)     (23,132)     (17,123)
  Loan repayments by
    participants...........            --        351,717       1,455,703          70,547        54,002       13,385       14,968
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
      Net transfers among
        funds and Plans....    (1,467,531)    (5,108,881)     (3,623,206)      9,622,269    (9,585,021)     425,263    1,686,468
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
      Total deductions and
        net
        transfers among
        funds and Plans....   (13,665,657)    (7,743,650)    (11,619,825)      9,564,692    (9,687,391)     353,818    1,681,203
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
        Net increase
          (decrease).......    70,294,343      2,653,886      51,899,686      11,217,258    (7,865,204)     981,660    2,009,588
Net assets available for
  benefits
        Beginning of
          year.............   201,027,012     47,101,602     122,356,648              --     7,865,204      917,410           --
                             ------------    -----------    ------------     -----------    ----------   ----------   ----------
        End of year........  $271,321,355    $49,755,488    $174,256,334     $11,217,258    $       --   $1,899,070   $2,009,588
                             ============    ===========    ============     ===========    ==========   ==========   ==========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        7
<PAGE>   9
<TABLE>
<CAPTION>
                               FIDELITY       FIDELITY                                       FIDELITY 
                                GROWTH        GROWTH &     T. ROWE PRICE      FIDELITY      RETIREMENT
                                COMPANY        INCOME       NEW INCOME      INTERMEDIATE      GROWTH  
                                 FUND        PORTFOLIO         FUND          BOND FUND         FUND   
                               -----------    ---------     -----------     ------------     --------
YEAR ENDED DECEMBER 31,        
1997                                           (PARTICIPANT DIRECTED; SEE NOTE 1)                                      
- ---------------------------   ------------------------------------------------------------------------
<S>                           <C>            <C>             <C>              <C>           <C>       
Additions to net assets                                                                               
  attributed to:                                                                                      
  Investment income                                                                                   
    Net appreciation                                                                                  
      (depreciation) in                                                                               
      market value of                                                                                 
      investments..........   $   132,733    $  579,477      $ 16,001         $   (385)     $  76,082 
    Interest...............         2,714        10,443           818              593          1,320 
    Dividends..............         1,750       152,679        27,833           13,476             -- 
                              -----------    ----------      --------         --------      --------- 
      Total investment                                                                                
        income (loss)......       137,197       742,599        44,652           13,684         77,402 
                              -----------    ----------      --------         --------      --------- 
  Contributions to the Plan                                                                           
    By participants........       156,328       581,351        63,867           45,634         65,368 
    By the employer........            --            --            --               --             -- 
                              -----------    ----------      --------         --------      --------- 
      Total                                                                                           
        contributions......       156,328       581,351        63,867           45,634         65,368 
                              -----------    ----------      --------         --------      --------- 
      Total additions......       293,525     1,323,950       108,519           59,318        142,770 
                              -----------    ----------      --------         --------      --------- 
Deductions from net assets                                                                            
  attributed to:                                                                                      
  Benefits paid to                                                                                    
    participants...........        (3,319)      (63,694)         (429)          (5,748)       (12,731)
                              -----------    ----------      --------         --------      --------- 
Transfers among funds and                                                                             
  Plans:                                                                                              
  Net reallocations........    (1,292,233)      447,177       860,202         (424,148)      (749,519)
  Loans to participants....       (17,553)      (67,432)       (3,818)          (1,570)        (4,171)
  Loan repayments by                                                                                  
    participants...........         8,529        40,127         3,336            1,981          5,606 
                              -----------    ----------      --------         --------      --------- 
      Net transfers among                                                                             
        funds and Plans....    (1,301,257)      419,872       859,720         (423,737)      (748,084)
                              -----------    ----------      --------         --------      --------- 
      Total deductions and                                                                            
        net                                                                                           
        transfers among                                                                               
        funds and Plans....    (1,304,576)      356,178       859,291         (429,485)      (760,815)
                              -----------    ----------      --------         --------      --------- 
        Net increase                                                                                  
          (decrease).......    (1,011,051)    1,680,128       967,810         (370,167)      (618,045)
Net assets available for                                                                              
  benefits                                                                                            
        Beginning of                                                                                  
          year.............     1,011,051     1,990,417            --          370,167        618,045 
                              -----------    ----------      --------         --------      --------- 
        End of year........   $        --    $3,670,545      $967,810         $     --      $      -- 
                              ===========    ==========      ========         ========      ========= 

</TABLE>

<TABLE>
<CAPTION>                    
                                T. ROWE                                                      THE GEORGE  
                                 PRICE        FIDELITY     EUROPACIFIC          FIDELITY       PUTNAM    
                                MID-CAP         OTC          GROWTH             OVERSEAS       FUND OF   
                              GROWTH FUND    PORTFOLIO        FUND                FUND        BOSTON A   
                              -----------    ---------     -----------          --------     ----------  
YEAR ENDED DECEMBER 31,       
1997                                           (PARTICIPANT DIRECTED; SEE NOTE 1)     
- ---------------------------   -------------------------------------------------------------------------
<S>                           <C>            <C>           <C>                <C>           <C>         
Additions to net assets                                                                                  
  attributed to:                                                                                         
  Investment income                                                                                      
    Net appreciation                                                                                     
      (depreciation) in                                                                                  
      market value of                                                                                    
      investments..........   $  106,345     $   53,339    $  (135,820)       $  150,790    $   (46,430)   
    Interest...............        1,943          1,578          2,634             2,247          6,874  
    Dividends..............       16,441             --         67,423                --        372,038  
                              ----------     ----------    -----------        ----------    -----------  
      Total investment                                                                                 
        income (loss)......      124,729         54,917        (65,763)          153,037        332,482  
                              ----------     ----------    -----------        ----------    -----------  
  Contributions to the Plan                                                                            
    By participants........      155,874        126,254        162,382           113,945        246,119  
    By the employer........           --             --             --                --             --  
                              ----------     ----------    -----------        ----------    -----------  
      Total                                                                                            
        contributions......      155,874        126,254        162,382           113,945        246,119  
                              ----------     ----------    -----------        ----------    -----------  
      Total additions......      280,603        181,171         96,619           266,982        578,601  
                              ----------     ----------    -----------        ----------    -----------  
Deductions from net assets                                                                             
  attributed to:                                                                                       
  Benefits paid to                                                                                     
    participants...........       (8,559)        (2,884)        (3,765)           (1,923)       (92,117) 
                              ----------     ----------    -----------        ----------    -----------  
Transfers among funds and                                                                              
  Plans:                                                                                               
  Net reallocations........    1,344,381       (892,695)     1,275,686        (1,069,901)     4,416,826  
  Loans to participants....      (31,446)       (12,283)       (27,859)           (4,473)       (33,996) 
  Loan repayments by                                                                                   
    participants...........        8,751          6,157         10,789             7,378         28,741  
                              ----------     ----------    -----------        ----------    -----------  
      Net transfers among                                                                              
        funds and Plans....    1,321,686       (898,821)     1,258,616        (1,066,996)     4,411,571  
                              ----------     ----------    -----------        ----------    -----------  
      Total deductions and                                                                             
        net                                                                                            
        transfers among                                                                                
        funds and Plans....    1,313,127       (901,705)     1,254,851        (1,068,919)     4,319,454  
                              ----------     ----------    -----------        ----------    -----------  
        Net increase                                                                                   
          (decrease).......    1,593,730       (720,534)     1,351,470          (801,937)     4,898,055  
Net assets available for                                                                               
  benefits                                                                                             
        Beginning of                                                                                   
          year.............           --        720,534             --           801,937             --  
                              ----------     ----------    -----------        ----------    -----------  
        End of year........   $1,593,730     $       --    $ 1,351,470        $       --    $ 4,898,055  
                              ==========     ==========    ===========        ==========    ===========  

</TABLE>
                                        8              
<PAGE>   10
<TABLE>
<CAPTION>
                                               FIDELITY       FIDELITY        SPARTAN       FIDELITY    
                                 FIDELITY     RETIREMENT     RETIREMENT     U.S. EQUITY    LOW-PRICED   
                                 BALANCED       MONEY        GOVERNMENT        INDEX         STOCK      
                                   FUND         MARKET      MONEY MARKET       FUND           FUND      
YEAR ENDED DECEMBER 31,         --------     ----------    ------------    -----------    ----------   
1997                                                                                                   
- ---------------------------    ---------------------------------------------------------------------
<S>                           <C>           <C>           <C>             <C>            <C>          
Additions to net assets                                                                                
  attributed to:                                                                                       
  Investment income                                                                                    
    Net appreciation                                                                                   
      (depreciation) in                                                                                
      market value of                                                                                  
      investments..........    $  434,988    $       --    $        --     $  177,590      $   (137)   
    Interest...............         7,354        16,271          7,995          4,368            85    
    Dividends..............        78,677       256,899        125,932         19,917        17,909    
                               ----------    ----------    -----------     ----------      --------    
      Total investment                                                                                 
        income (loss)......       521,019       273,170        133,927        201,875        17,857    
                               ----------    ----------    -----------     ----------      --------    
  Contributions to the Plan                                                                            
    By participants........       168,232       489,643        199,856        185,443        24,864    
    By the employer........            --            --             --             --            --    
                               ----------    ----------    -----------     ----------      --------    
      Total                                                                                            
        contributions......       168,232       489,643        199,856        185,443        24,864    
                               ----------    ----------    -----------     ----------      --------    
      Total additions......       689,251       762,813        333,783        387,318        42,721    
                               ----------    ----------    -----------     ----------      --------    
Deductions from net assets                                                                             
  attributed to:                                                                                       
  Benefits paid to                                                                                     
    participants...........       (77,610)     (647,540)      (312,088)       (23,025)           --    
                               ----------    ----------    -----------     ----------      --------    
Transfers among funds and                                                                              
  Plans:                                                                                               
  Net reallocations........    (4,443,673)    7,043,977     (4,622,118)       214,044       421,994    
  Loans to participants....       (17,253)      (88,325)       (34,327)       (21,098)       (3,546)   
  Loan repayments by                                                                                   
    participants...........        34,430        47,516         29,057         12,040           278    
                               ----------    ----------    -----------     ----------      --------    
      Net transfers among                                                                              
        funds and Plans....    (4,426,496)    7,003,168     (4,627,388)       204,986       418,726    
                               ----------    ----------    -----------     ----------      --------    
      Total deductions and                                                                             
        net                                                                                            
        transfers among                                                                                
        funds and Plans....    (4,504,106)    6,355,628     (4,939,476)       181,961       418,726    
                               ----------    ----------    -----------     ----------      --------    
        Net increase                                                                                   
          (decrease).......    (3,814,855)    7,118,441     (4,605,693)       569,279       461,447    
Net assets available for                                                                               
  benefits                                                                                             
        Beginning of                                                                                   
          year.............     3,814,855     2,214,903      4,605,693        509,134            --    
                               ----------    ----------    -----------     ----------      --------    
        End of year........    $       --    $9,333,344    $        --     $1,078,413      $461,447    
                               ==========    ==========    ===========     ==========      ========    
                             
</TABLE>                                                    
<TABLE>
<CAPTION>
                                                            TEMPLETON   
                                FRANKLIN         PUTNAM     DEVELOPING    T. ROWE PRICE  PARTICIPANTS' 
                                SMALL CAP       VOYAGER      MARKETS        DIVIDEND        LOAN      
                              GROWTH FUND I      FUND A      TRUST I       GROWTH FUND     ACCOUNT    
                              -------------     -------     ----------   -------------  ------------- 
YEAR ENDED DECEMBER 31,                                                                                     
1997                                                                                                             
- ---------------------------  ------------------------------------------------------------------------
<S>                           <C>              <C>         <C>              <C>         <C>           
Additions to net assets                                                             
  attributed to:               
  Investment income            
    Net appreciation           
      (depreciation) in        
      market value of          
      investments..........      $(28,786)     $(12,781)      $(61,636)      $  8,005   $        --     
    Interest...............           255           185            246            130            --     
    Dividends..............        20,650        27,348         15,866         11,701            --     
                                 --------      --------       --------       --------   -----------     
      Total investment                                                                                    
        income (loss)......        (7,881)       14,752        (45,524)        19,836            --     
                                 --------      --------       --------       --------   -----------     
  Contributions to the Plan                                                                          
    By participants........        29,422        22,071         18,153         13,200            --     
    By the employer........            --            --             --             --            --     
                                 --------      --------       --------       --------   -----------     
      Total                                                                                          
        contributions......        29,422        22,071         18,153         13,200            --     
                                 --------      --------       --------       --------   -----------     
      Total additions......        21,541        36,823        (27,371)        33,036            --     
                                 --------      --------       --------       --------   -----------     
Deductions from net assets                                                                           
  attributed to:                                                                                     
  Benefits paid to                                                                                   
    participants...........            --          (284)        (2,792)       (23,449       (48,124)    
                                 --------      --------       --------       --------   -----------     
Transfers among funds and                                                                            
  Plans:                                                                                             
  Net reallocations........       477,493       428,293        281,063        293,062      (164,255)    
  Loans to participants....        (5,962)       (1,790)          (357)            --     3,607,502     
  Loan repayments by                                                                                 
    participants...........           728         1,005            572            453    (2,207,796)    
                                 --------      --------       --------       --------   -----------     
      Net transfers among                                                                            
        funds and Plans....       472,259       427,508        281,278        293,515     1,235,451     
                                 --------      --------       --------       --------   -----------     
      Total deductions and                                                                           
        net                                                                                          
        transfers among                                                                              
        funds and Plans....       472,259       427,224        278,486        270,066     1,187,327     
                                 --------      --------       --------       --------   -----------     
        Net increase                                                                                 
          (decrease).......       493,800       464,047        251,115        303,102     1,187,327     
Net assets available for                                                                             
  benefits                                                                                           
        Beginning of                                                                                 
          year.............            --            --             --             --     6,129,412     
                                 --------      --------       --------       --------   -----------     
        End of year........      $493,800      $464,047       $251,115       $303,102   $ 7,316,739     
                                 ========      ========       ========       ========   ===========     


                                        9 
</TABLE>   
<PAGE>   11
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                         NOTES TO FINANCIAL STATEMENTS
 
1. DESCRIPTION OF THE PLAN:
 
     The Merck & Co., Inc. Employee Stock Purchase and Savings Plan (the "Plan")
was designed to provide an easy, economical way for employees to become
stockholders of Merck & Co., Inc. (the "Company" or "Merck") as well as a
systematic means of saving and investing for the future. Generally, any regular
full-time, part-time, or temporary employee of the Company who is a U.S.
resident covered by a collective bargaining agreement providing for
participation in this Plan as defined by the Plan document, and has completed
one year of employment, is eligible to participate.
 
     The Plan is administered by a management committee appointed by the Chief
Executive Officer of the Company. All costs of administering the Plan are borne
by the Company.
 
     Participants should refer to the Summary Plan Description for a complete
description of benefits provided.
 
     CONTRIBUTIONS
 
     Depending on the terms of the applicable collective bargaining agreements,
participants may contribute from 2% up to either 10% or 15% of their base pay
per pay period. In addition, the Company will match 50% of employee
contributions up to 5% of base pay per pay period, or contributions of a
predetermined dollar amount negotiated with each bargaining group, whichever is
less. Pursuant to certain collective bargaining agreements, the Company match is
subject to a monthly cap of $60. Company matching contributions are invested
entirely in the Merck Common Stock Fund (Non-participant directed), and may not
be reallocated into any other investment option, except certain unions that have
negotiated to allow a percentage of Company matching contributions to follow the
direction of the participants' contributions.
 
     INVESTMENT OPTIONS
 
     Participants direct the investment of their contributions into any
investment option including the Merck Common Stock Fund (Participant directed).
The following is a brief description of each option:
 
     Merck Common Stock Fund
 
     The Merck Common Stock Fund invests primarily in Merck common stock and a
small portion of money market instruments for liquidity. This liquidity allows
for daily trading in the fund. Ownership is measured in units rather than
shares. An investment in this option allows the participant to become a
stockholder and part owner of the Company. The value of the investment can go up
or down depending on general factors affecting the stock market and specific
factors affecting the Company's business. This is neither a mutual fund nor a
diversified or managed investment option. Investing in a non-diversified single
stock involves more investment risk than investing in a diversified fund.
 
     T. Rowe Price Blue Chip Growth Fund
 
     The T. Rowe Price Blue Chip Growth Fund seeks to provide long-term growth
of capital. The fund invests primarily (at least 65% of its assets) in common
stocks of large and medium-sized blue chip companies that have the potential for
above-average earnings growth and are well established in their respective
industries. The fund may also invest in convertible stocks and bonds, preferred
stocks, bonds and warrants. Up to 20% of assets (excluding reserves) may be
invested in foreign securities, which may be subject to currency risks and
political and sovereign risks of the home country.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Magellan Fund
 
     Funds are invested primarily in domestic and foreign common stock and
securities convertible into common stock. Up to 20% of assets may also be
invested in debt securities of all types and qualities issued by foreign and
domestic issuers if the fund manager believes they have potential for capital
appreciation.
 
                                       10
<PAGE>   12
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Equity-Income Fund
 
     Funds are invested in income-producing equity securities. Normally, at
least 65% of the fund's assets will be invested in income producing equity
securities. The fund has the flexibility to invest the balance in all types of
domestic and foreign securities, including bonds.
 
     Vanguard U.S. Growth Portfolio
 
     Vanguard U.S. Growth Portfolio seeks to provide long-term capital growth by
investing in equity securities of large, established U.S. companies that have
good growth records, strong market positions and have exhibited long-term
financial strength to provide potential long-term growth.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Growth Company Fund
 
     Funds are invested primarily in common stock, and securities convertible
into common stock, of companies considered to have above-average growth
characteristics. These characteristics are most often associated with companies
in new and emerging areas of the economy, although the fund may also hold shares
in larger, mature or declining industry firms which have been revitalized.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Growth & Income Portfolio
 
     Funds are invested primarily in U.S. and foreign stocks, focusing on those
that pay current dividends and offer potential growth of earnings such as common
stocks, convertible securities, preferred stocks and warrants.
 
     T. Rowe Price New Income Fund
 
     The T. Rowe Price New Income Fund is a bond fund that seeks to provide the
highest level of income consistent with preservation of capital by purchasing
securities that have been rated as investment-grade by Standard & Poor's,
Moody's or Fitch Investor Services. The fund invests at least 80% of its assets
in income-producing investment-grade debt securities including U.S. government
and agency securities, corporate bonds, bank obligations and utilities. The
fund's dollar-weighted average maturity is generally expected to be between four
and fifteen years.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Intermediate Bond Fund
 
     This fund seeks high current income by investing in U.S. and foreign
investment grade debt securities rated Baa or better by Moody's or BBB or better
by Standard & Poor's. Investment securities include corporate bonds, mortgage
securities, bank obligations and U.S. government and agency securities, as well
as short-term investments. The fund's dollar-weighted average maturity will
range between three and ten years under normal circumstances.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     Fidelity Retirement Growth Fund
 
     Funds are invested primarily in common stocks of domestic or foreign
issuers, although they can be invested in all types of securities. Foreign
securities may involve a higher degree of risk. The fund's emphasis is on the
realization of capital gains rather than on dividend income.
 
                                       11
<PAGE>   13
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     T. Rowe Price Mid-Cap Growth Fund
 
     T. Rowe Price Mid-Cap Growth Fund seeks to provide long-term capital
appreciation by investing primarily in the stock of medium-sized (mid-cap)
growth companies that offer the potential for above-average earnings growth. The
fund focuses on companies that are no longer considered new or emerging, but are
well-established. It may also invest in convertible securities, warrants and
foreign securities, which are subject to greater risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity OTC Portfolio
 
     Funds are invested primarily in securities traded on the over-the-counter
securities market. These are frequently the securities of smaller or newer
companies whose instruments may have limited marketability and may be subject to
more erratic market movement.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     EuroPacific Growth Fund
 
     This fund seeks long-term capital growth by investing primarily in
securities of companies outside the United States. Normally, at least 65% of the
fund's total assets will be invested in Europe or the Pacific Basin. The Pacific
Basin is generally defined as those countries bordering the Pacific Ocean and
includes, but is not limited to Australia, Canada, Japan, Malaysia and
Singapore. The fund may also invest in convertible securities, debt and
government securities and preferred stock. Foreign investment, especially in
developing countries, involve greater risks and may offer greater potential.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Fidelity Overseas Fund
 
     This fund seeks long-term capital growth by investing primarily in foreign
securities. The investments may include common stock and securities convertible
into common stock, as well as debt instruments.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
     The George Putnam Fund of Boston A
 
     This fund seeks to provide a balanced investment comprised of a
well-diversified portfolio of stocks and bonds that will produce both capital
growth and current income. Normally, no more than 75% of the fund's assets will
be invested in common stocks and convertible securities.
 
     This investment option was added to the Plan effective July 1, 1997
 
     Fidelity Balanced Fund
 
     Funds are invested in a broadly diversified portfolio of high-yielding
securities, including common stocks, preferred stocks and bonds. The objective
is to provide a balanced investment in both stocks and bonds, thereby affording
the opportunity for capital growth and current income; however, at least 25% of
total assets will always be invested in fixed-income senior securities.
 
     This investment option was eliminated from the Plan effective June 30,
1997.
 
                                       12
<PAGE>   14
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Fidelity Retirement Money Market
 
     Funds are invested in high-quality U.S. dollar-denominated money market
instruments of U.S. and foreign issuers. Normally, the fund intends to invest
more than 25% of its total assets in obligations of institutions in the
financial services industry.
 
     Fidelity Retirement Government Money Market
 
     Funds are invested in obligations issued or guaranteed as to principal and
interest by the U.S. government, its agencies or instrumentalities, and in
repurchase agreements secured by these obligations. An investment in the
portfolio is not insured or guaranteed by the U.S. government.
 
     This option was eliminated from the Plan effective June 30, 1997.
 
     Spartan U.S. Equity Index Fund
 
     Funds are primarily invested in securities of the companies which comprise
the S&P 500 Index. Effective April 18, 1997, the fund name was changed from
Fidelity U.S. Equity Index Portfolio to the Spartan U.S. Equity Index Fund.
 
     Fidelity Low-Priced Stock Fund
 
     This fund seeks capital appreciation by investing mainly in low-priced
domestic and foreign common stocks ($35 or less at time of purchase). Foreign
securities may involve a higher degree of risk. This fund charges a redemption
fee to discourage short-term buying and selling of fund shares. If fund shares
are sold after being held for less than 90 days, the fund will deduct a
redemption fee from participants' accounts equal to 1.5% of the value of the
shares sold.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Franklin Small Cap Growth Fund I
 
     This fund seeks long-term capital growth by investing primarily in stocks
of companies with market capitalization of less than $1 billion at the time of
the investment. The fund tries to invest at least one-third of its assets in
stocks of companies with market capitalization of $550 million or less. Although
the fund's assets are invested primarily in small companies, it may invest up to
35% of its total assets in larger capitalized companies with strong growth
potential, in relatively well-known larger companies in mature industries with
potential for capital appreciation, or in corporate debt securities, including
bonds, notes and debentures if deemed appropriate. The fund may also invest up
to 25% of its total assets in foreign securities, which may involve greater
risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Putnam Voyager Fund A
 
     This fund seeks capital appreciation by investing primarily in common
stocks of companies that have potential for capital appreciation which is
significantly greater than that of the market averages. The fund may also invest
in convertible bonds, convertible preferred stocks, warrants, preferred stocks,
money market instruments and debt securities. The fund may invest up to 20% of
its total assets in securities principally traded in foreign markets. Foreign
securities are subject to currency, political, financial or sovereign risks of
the issuer's home country.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     Templeton Developing Markets Trust I
 
     This fund seeks long-term capitalization by investing in equity securities
of emerging market countries.  The fund may invest up to 35% of its total assets
in debt securities, including bonds, notes, debentures,
 
                                       13
<PAGE>   15
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
commercial paper, certificates of deposit, time deposits and bankers'
acceptances. Foreign investments may involve greater risks.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     T. Rowe Price Dividend Growth Fund
 
     This fund seeks to provide increasing dividend income over time, long-term
capital appreciation and reasonable current income through investments primarily
in dividend-paying stocks. The fund may also invest in bonds and foreign
securities.
 
     This investment option was added to the Plan effective July 1, 1997.
 
     VESTING
 
     Participants are immediately vested in their contributions, all Company
matching contributions, plus actual earnings thereon.
 
     PLAN TERMINATION
 
     Although it has not expressed any intent to do so, the Company has the
right under the Plan to discontinue its contributions at any time and to
terminate the Plan subject to the provisions of the Employee Retirement Income
Security Act of 1974.
 
     PARTICIPANTS' LOAN ACCOUNT
 
     Participants may borrow from their account balances with interest charged
at the prime rate plus 1%. Loan terms range from one to five years or up to
thirty years for the purchase of a primary residence. The minimum loan is $500
and the maximum loan is the lesser of $50,000 less the highest outstanding loan
balance during the one year period prior to the new loan application date, or
50% of the participant's account balance less any current outstanding loan.
Activity related to these borrowings is reflected in the Participants' Loan
Account column of the financial statements.
 
     BENEFITS PAID TO PARTICIPANTS
 
     In-service (which include hardship withdrawals) and termination
distributions are made throughout the year in accordance with applicable Plan
provisions. At December 31, 1997 and 1996, net assets available for benefits
included distributions in process of payment of $698,384 and $610,665,
respectively.
 
2.  SUMMARY OF ACCOUNTING POLICIES:
 
     The financial statements of the Plan have been prepared on the accrual
basis of accounting. The investments of the Plan are stated at quoted market
value. Dividend income is recorded on the ex-dividend date. The net appreciation
(depreciation) in market value of investments is based on the beginning of the
year market value or value at the time of purchase during the year and is
included in the statement of changes in net assets available for benefits.
 
     USE OF ESTIMATES
 
     The financial statements are prepared in conformity with generally accepted
accounting principles and, accordingly, include amounts that are based on
management's best estimates and judgments. Actual results could differ from
these estimates.
 
     RECLASSIFICATIONS
 
     Certain prior year amounts shown in the accompanying financial statements
have been reclassified to conform to the current year's presentation.
 
                                       14
<PAGE>   16
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
3.  INCOME TAXES:
 
     The Plan obtained a tax determination letter from the Internal Revenue
Service on September 18, 1995 indicating that it had been designed in accordance
with applicable sections of the Internal Revenue Code ("IRC"). The Plan was most
recently amended in April 1997. The Plan sponsor believes that the Plan is
designed and currently operated in compliance with the IRC.
 
4.  OTHER MATTERS:
 
     Net reallocations in 1997 of ($1,467,531) consist of transfers between the
Plan and the Merck & Co., Inc. Employee Savings and Security Plan for employees
who changed their status during the year.
 
5.  PARTY-IN-INTEREST:
 
     All transactions of party-in-interest are set forth on the attached
schedule.
 
6.  SUBSEQUENT EVENTS:
 
     Effective January 1, 1998, the Company matching contributions for
Inter-Union Council employees increased from 50% of employee contribution up to
5% of base pay subject to a $60 monthly cap, to 50% of employee contribution up
to 6% of base pay and eliminated the monthly cap of $60.
 
                                       15
<PAGE>   17
 
                                                           SCHEDULE I
                                                           EIN: 22-1109110
                                                           PLAN NO.: 004
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
          ITEM 27a -- SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
 
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                 NUMBER OF
                                                              UNITS/SHARES AT
             NAME OF ISSUER AND TITLE OF ISSUE                CLOSE OF PERIOD       COST       CURRENT VALUE
             ---------------------------------                ---------------   ------------   -------------
<S>                                                           <C>               <C>            <C>
Merck Common Stock Fund*....................................    12,256,932      $ 81,677,890   $222,694,287
T. Rowe Price Blue Chip Growth Fund.........................       463,316        10,349,380     11,198,335
Fidelity Equity-Income Fund.................................        36,174         1,565,546      1,895,866
Vanguard U.S. Growth Portfolio..............................        69,902         1,982,374      2,006,198
Fidelity Growth & Income Portfolio..........................        96,180         2,872,704      3,664,353
T. Rowe Price New Income Fund...............................       106,524           951,338        966,177
T. Rowe Price Mid-Cap Growth Fund...........................        55,631         1,492,272      1,591,041
EuroPacific Growth Fund.....................................        51,852         1,482,709      1,349,190
The George Putnam Fund of Boston A..........................       271,957         4,940,926      4,889,792
Fidelity Retirement Money Market............................     9,317,599         9,317,599      9,317,599
Spartan U.S. Equity Index Fund..............................        30,778           862,315      1,076,594
Fidelity Low-Priced Stock Fund..............................        18,331           460,684        460,669
Franklin Small Cap Growth Fund I............................        21,499           516,216        492,967
Putnam Voyager Fund A.......................................        24,318           476,367        463,264
Templeton Developing Markets Trust I........................        19,373           310,202        250,691
T. Rowe Price Dividend Growth Fund..........................        15,032           295,662        302,591
Participants' Loan Account (with interest
  ranging from 6.5% to 12.5%)...............................            --         7,301,295      7,301,295
                                                                                ------------   ------------
        Total Investments...................................                    $126,855,479   $269,920,909
                                                                                ============   ============
</TABLE>
 
- ---------------
* Denotes a party-in-interest to the Plan.
 
                                       16
<PAGE>   18
 
                                                           SCHEDULE II
                                                           EIN: 22-1109110
                                                           PLAN NO.: 004
 
                               MERCK & CO., INC.
 
                    EMPLOYEE STOCK PURCHASE AND SAVINGS PLAN
 
               ITEM 27d -- SCHEDULE OF REPORTABLE TRANSACTIONS(a)
 
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                                                     CURRENT
                                                                                                      VALUE
                                                       PURCHASE                      COST OF       OF ASSETS ON
IDENTITY OF PARTY INVOLVED AND DESCRIPTION OF ASSETS    PRICE      SELLING PRICE      ASSET      TRANSACTION DATE   NET GAIN
- ----------------------------------------------------  ----------   -------------   -----------   ----------------   ---------
<S>                                                  <C>            <C>            <C>             <C>               <C>
Merck Common Stock Fund
    249 purchase transactions.....................   $26,010,654    $       --     $26,010,654     $26,010,654     $       --
    247 sales transactions........................            --    29,032,224      13,253,715      29,032,224     15,778,509
T. Rowe Price Blue Chip Growth Fund
    103 purchase transactions.....................    11,297,445            --      11,297,445      11,297,445             --
    91 sales transactions.........................            --       988,048         948,065         988,048         39,983
Fidelity Magellan Fund
    104 purchase transactions.....................       936,420            --         936,420         936,420             --
    101 sales transactions........................            --     9,881,710       7,908,116       9,881,710      1,973,594
Fidelity Retirement Money Market Portfolio
    178 purchase transactions.....................    15,114,089            --      15,114,089      15,114,089             --
    157 sales transactions........................            --     8,006,870       8,006,870       8,006,870             --
</TABLE>
 
- ---------------
 
(a) Reportable transactions are transactions that, individually or in the
    aggregate, exceed 5% of the Plan's net assets as of the beginning of the
    Plan year.
 
                                       17
<PAGE>   19
 
                                                                      EXHIBIT 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference of our report dated April 30, 1998 included in the financial
statements and exhibits required by Form 11-K Annual Report for the Merck & Co.,
Inc. Employee Stock Purchase and Savings Plan into the Company's previously
filed Registration Statements on Form S-8 (Nos. 33-21087, 33-21088, 33-36101,
33-40177, 33-51235, 33-53463, 33-64273, 33-64665, 333-23293 and 333-23295), on
Form S-4 (No. 33-50667) and on Form S-3 (Nos. 33-60322, 33-39349, 33-51785,
33-57421, 333-17045 and 333-36383). It should be noted that we have not audited
any financial statements of the Plan subsequent to December 31, 1997 or
performed any audit procedures subsequent to the date of our report.
 
                                            ARTHUR ANDERSEN LLP
 
New York, New York
June 22, 1998

<PAGE>   1
 
                                                                   EXHIBIT 99(c)
 
                       FINANCIAL STATEMENTS AND EXHIBITS
                      REQUIRED BY FORM 11-K ANNUAL REPORT
        PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
                           COMMISSION FILE NO. 1-3305
 
                             ---------------------
 
                   HUBBARD FARMS, INC. EMPLOYEE SAVINGS PLAN
                            (FULL TITLE OF THE PLAN)
 
                               MERCK & CO., INC.
                                  P.O. BOX 100
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
             (NAME OF ISSUER OF THE SECURITIES HELD PURSUANT TO THE
            PLAN AND THE ADDRESS OF ITS PRINCIPAL EXECUTIVE OFFICE)
<PAGE>   2
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Merck & Co., Inc.:
 
     We have audited the accompanying statements of net assets available for
benefits of the Hubbard Farms, Inc. Employee Savings Plan (the "Plan") as of
December 31, 1997 and 1996, and the related statement of changes in net assets
available for benefits for the year ended December 31, 1997. These financial
statements and the schedules referred to below are the responsibility of the
Plan's management. Our responsibility is to express an opinion on these
financial statements and schedules based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the net assets available for benefits of the Plan as
of December 31, 1997 and 1996, and the changes in its net assets available for
benefits for the year ended December 31, 1997, in conformity with generally
accepted accounting principles.
 
     Our audits were performed for the purpose of forming an opinion on the
basic financial statements taken as a whole. The supplemental schedules of
assets held for investment purposes and reportable transactions are presented
for purposes of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure under
the Employee Retirement Income Security Act of 1974. The fund information in the
statements of net assets available for benefits and the statement of changes in
net assets available for benefits is presented for purposes of additional
analysis rather than to present the net assets available for plan benefits and
changes in net assets available for plan benefits of each fund. The supplemental
schedules and fund information have been subjected to the auditing procedures
applied in the audits of the basic financial statements and, in our opinion, are
fairly stated in all material respects in relation to the basic financial
statements taken as a whole.
 
                                                  ARTHUR ANDERSEN LLP
 
New York, New York
April 30, 1998
 
                                        1
<PAGE>   3
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                                                                             FIDELITY   FIDELITY
                                                           MERCK       FIDELITY    FIDELITY     FIDELITY      GROWTH    GROWTH &
                                                           COMMON      MAGELLAN    BALANCED   INTERMEDIATE   COMPANY     INCOME
                                              TOTAL        STOCK         FUND        FUND      BOND FUND       FUND     PORTFOLIO
                                            ----------   ----------   ----------   --------   ------------   --------   ---------
<S>                                         <C>          <C>          <C>          <C>          <C>          <C>        <C>
DECEMBER 31, 1997
Assets:
  Investments at market value.............  $5,548,215   $3,140,776   $1,063,324   $405,620     $242,648     $ 77,894   $157,504
                                            ----------   ----------   ----------   --------     --------     --------   --------
  Receivables
    Employer's contribution...............       3,832        1,792          744        332          190          177        205
    Participants' contributions...........      12,256        5,847        2,397      1,101          574          550        659
    Accrued dividends.....................      13,179       13,179           --         --           --           --         --
                                            ----------   ----------   ----------   --------     --------     --------   --------
        Total receivables.................      29,267       20,818        3,141      1,433          764          727        864
                                            ----------   ----------   ----------   --------     --------     --------   --------
Net assets available for benefits.........  $5,577,482   $3,161,594   $1,066,465   $407,053     $243,412     $ 78,621   $158,368
                                            ==========   ==========   ==========   ========     ========     ========   ========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        2
<PAGE>   4
<TABLE>
<CAPTION>
                                                                      FIDELITY                  
                                             FIDELITY    FIDELITY    RETIREMENT    PARTICIPANTS'
                                                OTC      OVERSEAS    GOVERNMENT        LOAN     
                                             PORTFOLIO     FUND     MONEY MARKET      ACCOUNT   
                                             ---------   --------   ------------   -------------
<S>                                         <C>        <C>          <C>            <C>        
DECEMBER 31, 1997
Assets:
  Investments at market value.............  $24,826      $21,174      $278,489       $135,960   
                                            -------      -------      --------       --------   
  Receivables                                                                                 
    Employer's contribution...............       76           39           277             --   
    Participants' contributions...........      253          133           742             --   
    Accrued dividends.....................       --           --            --             --   
                                            -------      -------      --------       --------   
        Total receivables.................      329          172         1,019             --   
                                            -------      -------      --------       --------   
Net assets available for benefits.........  $25,155      $21,346      $279,508       $135,960   
                                            =======      =======      ========       ========   
</TABLE>



                                       3
<PAGE>   5
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                                                                                         FIDELITY
                                                        MERCK      FIDELITY   FIDELITY     FIDELITY                       GROWTH
                                                        COMMON     MAGELLAN   BALANCED   INTERMEDIATE   FIDELITY DAILY   COMPANY
                                           TOTAL        STOCK        FUND       FUND      BOND FUND      INCOME TRUST      FUND
                                         ----------   ----------   --------   --------   ------------   --------------   --------
<S>                                      <C>          <C>          <C>        <C>          <C>             <C>           <C>
DECEMBER 31, 1996
Assets:
  Investments at market value..........  $3,669,124   $2,004,018   $763,082   $287,499     $195,624        $     --      $29,154
                                         ----------   ----------   --------   --------     --------        --------      -------
  Receivables
    Employer's contribution............       2,636        1,187        548        240          156              --           94
    Participants' contributions........       8,390        3,702      1,819        835          458              --          315
    Accrued dividends..................       9,934        9,934         --         --           --              --           --
                                         ----------   ----------   --------   --------     --------        --------      -------
        Total receivables..............      20,960       14,823      2,367      1,075          614              --          409
                                         ----------   ----------   --------   --------     --------        --------      -------
Net assets available for benefits......  $3,690,084   $2,018,841   $765,449   $288,574     $196,238        $     --      $29,563
                                         ==========   ==========   ========   ========     ========        ========      =======
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        4
<PAGE>   6
<TABLE>
<CAPTION>
                                         FIDELITY                             FIDELITY                  
                                         GROWTH &    FIDELITY    FIDELITY    RETIREMENT    PARTICIPANTS'
                                          INCOME        OTC      OVERSEAS    GOVERNMENT        LOAN     
                                         PORTFOLIO   PORTFOLIO     FUND     MONEY MARKET      ACCOUNT   
                                         ---------   ---------   --------   ------------   -------------
<S>                                      <C>         <C>         <C>         <C>             <C>            
DECEMBER 31, 1996
Assets:
  Investments at market value..........  $44,415     $8,845      $4,059      $233,731        $98,697
                                         -------     ------      ------      --------        -------
  Receivables                                                                                       
    Employer's contribution............       79         30          23           279             --
    Participants' contributions........      354        115          73           719             --
    Accrued dividends..................       --         --          --            --             --
                                         -------     ------      ------      --------        -------
        Total receivables..............      433        145          96           998             --
                                         -------     ------      ------      --------        -------
Net assets available for benefits......  $44,848     $8,990      $4,155      $234,729        $98,697
                                         =======     ======      ======      ========        =======
 
</TABLE>
 
                                        5
<PAGE>   7
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
           STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                                                                             FIDELITY   FIDELITY
                                                           MERCK       FIDELITY    FIDELITY     FIDELITY      GROWTH     GROWTH
                                                           COMMON      MAGELLAN    BALANCED   INTERMEDIATE   COMPANY    & INCOME
                                              TOTAL        STOCK         FUND        FUND      BOND FUND       FUND     PORTFOLIO
                                            ----------   ----------   ----------   --------   ------------   --------   ---------
<S>                                         <C>          <C>          <C>          <C>          <C>          <C>        <C>
YEAR ENDED DECEMBER 31, 1997
Additions to net assets attributed to:
  Investment income
    Net appreciation (depreciation) in
      market value of investments.........  $  911,530   $  714,493   $  148,204   $ 25,404     $  2,250     $   905    $ 20,408
    Interest..............................       9,519        4,190        2,550        865          628          39          14
    Dividends.............................     208,434       49,860       67,655     47,493       13,941       7,302       6,325
                                            ----------   ----------   ----------   --------     --------     -------    --------
      Total investment income.............   1,129,483      768,543      218,409     73,762       16,819       8,246      26,747
                                            ----------   ----------   ----------   --------     --------     -------    --------
  Contributions to the Plan
    By participants.......................     711,403      324,232      144,249     64,344       38,578      29,811      36,223
    By the employer.......................     215,355      102,012       43,202     19,188       12,212       8,865      10,223
                                            ----------   ----------   ----------   --------     --------     -------    --------
      Total contributions.................     926,758      426,244      187,451     83,532       50,790      38,676      46,446
                                            ----------   ----------   ----------   --------     --------     -------    --------
      Total additions.....................   2,056,241    1,194,787      405,860    157,294       67,609      46,922      73,193
                                            ----------   ----------   ----------   --------     --------     -------    --------
Deductions from net assets attributed to:
  Benefits paid to participants...........    (168,843)     (63,680)     (54,017)   (11,356)      (6,436)        (61)       (180)
                                            ----------   ----------   ----------   --------     --------     -------    --------
Transfers among funds:
    Net reallocations.....................          --        7,603      (21,908)   (21,049)     (11,426)      2,861      42,233
    Loans to participants.................          --      (13,425)     (40,490)   (10,773)      (5,188)       (786)     (1,801)
    Loan repayments by participants.......          --       17,468       11,571      4,363        2,615         122          75
                                            ----------   ----------   ----------   --------     --------     -------    --------
      Net transfers among funds...........          --       11,646      (50,827)   (27,459)     (13,999)      2,197      40,507
                                            ----------   ----------   ----------   --------     --------     -------    --------
      Total deductions and transfers among
        funds.............................    (168,843)     (52,034)    (104,844)   (38,815)     (20,435)      2,136      40,327
                                            ----------   ----------   ----------   --------     --------     -------    --------
        Net increase......................   1,887,398    1,142,753      301,016    118,479       47,174      49,058     113,520
Net assets available for benefits
        Beginning of year.................   3,690,084    2,018,841      765,449    288,574      196,238      29,563      44,848
                                            ----------   ----------   ----------   --------     --------     -------    --------
        End of year.......................  $5,577,482   $3,161,594   $1,066,465   $407,053     $243,412     $78,621    $158,368
                                            ==========   ==========   ==========   ========     ========     =======    ========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        6
<PAGE>   8
<TABLE>
<CAPTION>
                                                                       FIDELITY                   
                                            FIDELITY    FIDELITY      RETIREMENT    PARTICIPANTS'
                                               OTC      OVERSEAS      GOVERNMENT        LOAN     
                                            PORTFOLIO     FUND       MONEY MARKET      ACCOUNT   
                                            ---------   --------    ------------    ------------
<S>                                         <C>         <C>           <C>             <C>
YEAR ENDED DECEMBER 31, 1997
Additions to net assets attributed to:
  Investment income
    Net appreciation (depreciation) in
      market value of investments.........  $   354     $  (488)      $     --        $     --
    Interest..............................       --          --          1,233              --
    Dividends.............................    1,708         998         13,152              --
                                            -------     -------       --------        --------
      Total investment income.............    2,062         510         14,385              --
                                            -------     -------       --------        --------
  Contributions to the Plan                                                                   
    By participants.......................   14,614      11,125         48,227              --
    By the employer.......................    3,214       2,020         14,419              --
                                            -------     -------       --------        --------
      Total contributions.................   17,828      13,145         62,646              --
                                            -------     -------       --------        --------
      Total additions.....................   19,890      13,655         77,031              --
                                            -------     -------       --------        -------- 
Deductions from net assets attributed to:   
  Benefits paid to participants...........     (918)       (256)       (31,939)             --
                                               
Transfers among funds:                     
    Net reallocations.....................       --       3,792         (2,106)             --  
    Loans to participants.................   (2,807)         --         (2,830)         78,100  
    Loan repayments by participants.......       --          --          4,623         (40,837  
                                            -------     -------       --------        --------  
      Net transfers among funds...........   (2,807)      3,792           (313)         37,263  
                                            -------     -------       --------        --------  
      Total deductions and transfers among                                                      
        funds.............................   (3,725)      3,536        (32,252)         37,263  
                                            -------     -------       --------        --------  
        Net increase......................   16,165      17,191         44,779          37,263  
Net assets available for benefits                                                               
        Beginning of year.................    8,990       4,155        234,729          98,697  
                                            -------     -------       --------        --------  
        End of year.......................  $25,155     $21,346       $279,508        $135,960  
                                            =======     =======       ========        ========  
</TABLE> 
                                        7
<PAGE>   9
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
                         NOTES TO FINANCIAL STATEMENTS
 
 1. DESCRIPTION OF THE PLAN:
 
     The Hubbard Farms, Inc. (the "Company") Employee Savings Plan (the "Plan")
was designed to provide an easy, economical way for employees to become
stockholders of Merck & Co., Inc. ("Merck"), the Joint Partner of the Company,
as well as a systematic means of saving and investing for the future. Regular
full-time and part-time employees of the Company and its domestic wholly-owned
subsidiaries as defined by the Plan document are eligible to participate in the
Plan the 1st of January or the 1st of July following their date of hire.
 
     The Plan is administered by a management committee appointed by the Board
of Directors of the Company. All costs of administering the Plan are borne by
the Company.
 
     Participants should refer to the Summary Plan description for a complete
description of benefits provided.
 
     LEGAL CHANGES
 
     Effective August 1, 1997, Hubbard Farms, Inc. became a part of Merial
Limited, a stand alone joint venture that is 50% owned by Merck & Co., Inc. and
50% owned by Rhone-Poulenc SA. The name Hubbard Farms, Inc. was changed to
Hubbard ISA effective August 1, 1997. However, the Plan retained the name
Hubbard Farms, Inc. Employee Savings Plan.
 
     CONTRIBUTIONS
 
     Participants may contribute from 2% up to 15% of their base pay. The
Company matches 50% of employee contributions up to 5% of base pay per pay
period.
 
     INVESTMENT OPTIONS
 
     Participants direct the investment of their contributions in 10% increments
into any investment option, including Merck Common Stock (Participant directed).
The following is a brief description of the options available in 1997 and 1996.
 
     Merck Common Stock
 
     This portfolio consists of shares of Merck common stock. The value of the
investment can go up or down depending on general factors affecting the stock
market and specific factors affecting Merck's business. This is neither a mutual
fund nor a diversified or managed investment option. Investing in a
non-diversified single stock involves more investment risk than investing in a
diversified fund.
 
     Fidelity Magellan Fund
 
     Funds are invested primarily in domestic and foreign common stock and
securities convertible into common stock. Up to 20% of assets may also be
invested in debt securities of all types and qualities issued by foreign and
domestic issuers if the fund manager believes they have potential for capital
appreciation.
 
     Fidelity Balanced Fund
 
     Funds are invested in a broadly diversified portfolio of high-yielding
securities, including common stocks, preferred stocks and bonds. The objective
is to provide a balanced investment in both stocks and bonds, thereby affording
the opportunity for capital growth and current income; however, at least 25% of
total assets will always be invested in fixed-income senior securities.
 
     Fidelity Intermediate Bond Fund
 
     This fund seeks high current income by investing in U.S. and foreign
investment grade debt securities rated Baa or better by Moody's or BBB or better
by Standard & Poor's. Investment securities include corporate bonds, mortgage
securities, bank obligations and U.S. government and agency securities, as well
as
 
                                        8
<PAGE>   10
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
short-term investments. The fund's dollar-weighted average maturity will range
between three and ten years under normal circumstances.
 
     Fidelity Growth Company Fund
 
     Funds are invested primarily in common stock, and securities convertible
into common stock, of companies considered to have above-average growth
characteristics. These characteristics are most often associated with companies
in new and emerging areas of the economy, although the fund may also hold shares
in larger, mature or declining industry firms which have been revitalized.
 
     Fidelity Growth & Income Portfolio
 
     Funds are invested primarily in U.S. and foreign stocks, focusing on those
that pay current dividends and offer potential growth of earnings such as common
stocks, convertible securities, preferred stocks and warrants.
 
     Fidelity OTC Portfolio
 
     Funds are invested primarily in securities traded on the over-the-counter
securities market. These are frequently the securities of smaller or newer
companies whose instruments may have limited marketability and may be subject to
more erratic market movement.
 
     Fidelity Overseas Fund
 
     This fund seeks long-term capital growth by investing primarily in foreign
securities. The investments may include common stock and securities convertible
into common stock, as well as debt instruments.
 
     Fidelity Retirement Government Money Market
 
     Funds are invested in obligations issued or guaranteed as to principal and
interest by the U.S. government, its agencies or instrumentalities, and in
repurchase agreements secured by these obligations. An investment in the
portfolio is not insured or guaranteed by the U.S. government.
 
     VESTING
 
     Participants are immediately vested in their contributions plus actual
earnings thereon. Participants become vested in Company matching contributions
after two years of service with the Company.
 
     FORFEITURES
 
     Any forfeitures by participants are used by the Company to reduce its
future matching contributions.
 
     PLAN TERMINATION
 
     Although it has not expressed any intent to do so, the Company has the
right under the Plan to discontinue its contributions at any time and to
terminate the Plan subject to the provisions of the Employee Retirement Income
Security Act of 1974.
 
                                        9
<PAGE>   11
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     PARTICIPANTS' LOAN ACCOUNT
 
     Participants may borrow against their account balances with interest
charged at the prime rate plus 1%. Loan terms range from one to five years or up
to thirty years for the purchase of a primary residence. The minimum loan is
$1,000 and the maximum loan is the lesser of $50,000 less the highest
outstanding loan balance during the one year period prior to the new loan
application date, or 50% of the participant's account balance less any current
outstanding loan. Activity related to these borrowings is reflected in the
Participants' Loan Account column of the financial statements.
 
     BENEFITS PAID TO PARTICIPANTS
 
     In-service (which include hardship withdrawals) and termination
distributions are made throughout the year in accordance with applicable Plan
provisions. At December 31, 1997 and 1996, net assets available for benefits
included distributions in process of payment of $51,118 and $874, respectively.
 
 2. SUMMARY OF ACCOUNTING POLICIES:
 
     The financial statements of the Plan have been prepared on the accrual
basis of accounting. The investments of the Plan are stated at quoted market
value. Dividend income is recorded on the ex-dividend date. The appreciation in
market value of investments is based on the beginning of the year market value
or value at the time of purchase during the year and is included in the
statement of changes in net assets available for benefits.
 
     USE OF ESTIMATES
 
     The financial statements are prepared in conformity with generally accepted
accounting principles and, accordingly, include amounts that are based on
management's best estimates and judgments. Actual results could differ from
these estimates.
 
 3. INCOME TAXES:
 
     The Plan obtained a tax determination letter from the Internal Revenue
Service on January 31, 1996 indicating that it had been designed in accordance
with applicable sections of the Internal Revenue Code ("IRC"). The Plan was most
recently amended in January 1996. The Company believes that the Plan is designed
and currently operated in compliance with the IRC.
 
 4. PARTY-IN-INTEREST:
 
     All transactions of party-in-interest are set forth on the attached
schedule.
 
                                       10
<PAGE>   12
 
                                                           SCHEDULE I
                                                           EIN:  02-0314630
                                                           PLAN NO.:  008
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
          ITEM 27a -- SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
 
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                NUMBER OF
                                                                SHARES AT
             NAME OF ISSUER AND TITLE OF ISSUE               CLOSE OF PERIOD         COST         CURRENT VALUE
             ---------------------------------               ---------------      ----------      -------------
<S>                                                          <C>                  <C>             <C>
Merck Common Stock*.........................................      29,630          $1,590,605       $3,140,776
Fidelity Magellan Fund......................................      11,161             865,674        1,063,324
Fidelity Balanced Fund......................................      26,563             361,848          405,620
Fidelity Intermediate Bond Fund.............................      23,859             243,075          242,648
Fidelity Growth Company Fund................................       1,798              76,762           77,894
Fidelity Growth & Income Portfolio..........................       4,134             134,963          157,504
Fidelity OTC Portfolio......................................         742              24,764           24,826
Fidelity Overseas Fund......................................         651              21,674           21,174
Fidelity Retirement Government Money Market.................     278,489             278,489          278,489
Participants' Loan Account (with interest rates ranging from
  6.5% to 10.0%)............................................          --             135,960          135,960
                                                                                  ----------       ----------
        Total Investments...................................                      $3,733,814       $5,548,215
                                                                                  ==========       ==========
</TABLE>
 
- ---------------
* Denotes a party-in-interest to the Plan.
 
                                       11
<PAGE>   13
 
                                                           SCHEDULE II
                                                           EIN:  02-0314630
                                                           PLAN NO.:  008
 
                              HUBBARD FARMS, INC.
 
                             EMPLOYEE SAVINGS PLAN
 
               ITEM 27d -- SCHEDULE OF REPORTABLE TRANSACTIONS(a)
 
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                                               CURRENT
                                                                                                VALUE
                                                          PURCHASE   SELLING    COST OF      OF ASSETS ON       NET
 IDENTITY OF PARTY INVOLVED AND DESCRIPTION OF ASSETS      PRICE      PRICE      ASSET     TRANSACTION DATE    GAIN
 ----------------------------------------------------     --------   --------   --------   ----------------   -------
<S>                                                      <C>         <C>        <C>        <C>                <C>
Merck Common Stock
    85 purchase transactions...........................  $505,057    $     --   $505,057       $505,057       $    --
    23 sales transactions..............................        --      82,792     52,623         82,792        30,169
Fidelity Magellan Fund
    92 purchase transactions...........................   276,735          --    276,735        276,735            --
    31 sales transactions..............................        --     124,697    102,758        124,697        21,939
Fidelity Balanced Fund
    76 purchase transactions...........................   136,289          --    136,289        136,289            --
    18 sales transactions..............................        --      43,573     37,660         43,573         5,913
</TABLE>
 
- ---------------
(a) Reportable transactions are transactions that, individually or in the
    aggregate, exceed 5% of the Plan's net assets as of the beginning of the
    Plan year.
 
                                       12
<PAGE>   14
 
                                                                      EXHIBIT 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference of our report dated April 30, 1998 included in the financial
statements and exhibits required by Form 11-K Annual Report for the Hubbard
Farms, Inc. Employee Savings Plan into Merck & Co., Inc.'s previously filed
Registration Statements on Form S-8 (Nos. 33-21087, 33-21088, 33-36101,
33-40177, 33-51235, 33-53463, 33-64273, 33-64665, 333-23293 and 333-23295), and
Form S-4 (No. 33-50667) and on Form S-3 (Nos. 33-60322, 33-39349, 33-51785,
33-57421, 333-17045 and 333-36383). It should be noted that we have not audited
any financial statements of the Plan subsequent to December 31, 1997 or
performed any audit procedures subsequent to the date of our report.
 
                                            ARTHUR ANDERSEN LLP
 
New York, New York
June 22, 1998

<PAGE>   1
 
                                                                   EXHIBIT 99(d)
 
                       FINANCIAL STATEMENTS AND EXHIBITS
                      REQUIRED BY FORM 11-K ANNUAL REPORT
        PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
                           COMMISSION FILE NO. 1-3305
 
                             ---------------------
 
              MERCK PUERTO RICO EMPLOYEE SAVINGS AND SECURITY PLAN
                            (FULL TITLE OF THE PLAN)
 
                               MERCK & CO., INC.
                                  P.O. BOX 100
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
             (NAME OF ISSUER OF THE SECURITIES HELD PURSUANT TO THE
            PLAN AND THE ADDRESS OF ITS PRINCIPAL EXECUTIVE OFFICE)
<PAGE>   2
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Merck Sharp & Dohme Quimica de Puerto Rico, Inc. and
Merck Sharp & Dohme (I.A.) Corp.:
 
     We have audited the accompanying statement of net assets available for
benefits of the Merck Puerto Rico Employee Savings and Security Plan (the
"Plan") as of December 31, 1997 and the related statement of changes in net
assets available for benefits for the period from inception (July 1, 1997)
through December 31, 1997. These financial statements and the schedules referred
to below are the responsibility of the Plan's management. Our responsibility is
to express an opinion on these financial statements and schedules based on our
audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the net assets available for benefits of the Plan as
of December 31, 1997, and the changes in its net assets available for benefits
for the period from inception (July 1, 1997) through December 31, 1997, in
conformity with generally accepted accounting principles.
 
     Our audit was performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedules of assets held
for investment purposes and reportable transactions are presented for purposes
of additional analysis and are not a required part of the basic financial
statements but are supplementary information required by the Department of
Labor's Rules and Regulations for Reporting and Disclosure under the Employee
Retirement Income Security Act of 1974. The fund information in the statement of
net assets available for benefits and the statement of changes in net assets
available for benefits is presented for purposes of additional analysis rather
than to present the net assets available for plan benefits and changes in net
assets available for plan benefits of each fund. The supplemental schedules and
fund information have been subjected to the auditing procedures applied in the
audit of the basic financial statements and, in our opinion, are fairly stated
in all material respects in relation to the basic financial statements taken as
a whole.
 
                                                  ARTHUR ANDERSEN LLP
 
San Juan, Puerto Rico
May 1, 1998
 
                                        1
<PAGE>   3
 
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                                       MERCK COMMON STOCK FUND
                                                                   --------------------------------
                                                                   (NON-PARTICIPANT   (PARTICIPANT    T. ROWE PRICE    FIDELITY
                                                                    DIRECTED: SEE     DIRECTED: SEE     BLUE CHIP       EQUITY-
                                                        TOTAL          NOTE 1)           NOTE 1)       GROWTH FUND    INCOME FUND
                                                        -----      ----------------   -------------   -------------   -----------
DECEMBER 31, 1997
- ---------------------------------------------------                                                   |--------------------------
<S>                                                  <C>              <C>              <C>              <C>           <C>
Assets:
  Investments at market value......................  $24,835,401      $6,993,525       $13,976,782      $571,614      $   273,159
                                                     -----------      ----------       -----------      --------      -----------
  Receivables
    Employer's contribution........................        8,576           1,921             5,299           300               43
    Participants' contributions....................       30,065              --            26,206         1,072              512
    Accrued interest and dividends.................       88,376          29,067            58,086            --               --
                                                     -----------      ----------       -----------      --------      -----------
      Total receivables............................      127,017          30,988            89,591         1,372              555
                                                     -----------      ----------       -----------      --------      -----------
Net assets available for benefits..................  $24,962,418      $7,024,513       $14,066,373      $572,986      $   273,714
                                                     ===========      ==========       ===========      ========      ===========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        2
<PAGE>   4
<TABLE>
<CAPTION>
                                                         FIDELITY                                                       THE GEORGE
                                           VANGUARD      GROWTH &     T. ROWE PRICE    T. ROWE PRICE    EUROPACIFIC       PUTNAM  
                                          U.S. GROWTH     INCOME       NEW INCOME         MID-CAP          GROWTH        FUND OF  
                                           PORTFOLIO     PORTFOLIO        FUND          GROWTH FUND         FUND         BOSTON A 
                                          -----------    ---------    -------------    -------------    -----------     ----------
DECEMBER 31, 1997                            (PARTICIPANT DIRECTED; SEE NOTE 1)                                                   
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>           <C>             <C>             <C>              <C>            <C>
Assets:                                  
  Investments at market value............  $112,653      $318,090        $11,848         $125,293         $90,947        $133,881  
                                           --------      --------        -------         --------         -------        --------  
  Receivables                                                                                                                      
    Employer's contribution..............        77           163              9              111              86              77  
    Participants' contributions..........       211           596             22              235             171             251  
    Accrued interest and dividends.......        --            --             --               --              --              --  
                                           --------      --------        -------         --------         -------        --------  
      Total receivables..................       288           759             31              346             257             328  
                                           --------      --------        -------         --------         -------        --------  
Net assets available for benefits........  $112,941      $318,849        $11,879         $125,639         $91,204        $134,209  
                                           ========      ========        =======         ========         =======        ========  

<CAPTION>
                                              FIDELITY       FIDELITY        SPARTAN       FIDELITY            
                                             RETIREMENT     RETIREMENT     U.S. EQUITY    LOW-PRICED           
                                               MONEY        GOVERNMENT        INDEX         STOCK              
                                               MARKET      MONEY MARKET       FUND           FUND              
                                             ----------    ------------    -----------    ----------           
DECEMBER 31, 1997                                                                                       
- ----------------------------------------------------------------------------------------------------      
<S>                                         <C>             <C>             <C>            <C>              
Assets:
  Investments at market value............   $353,066        $  --           $58,343        $5,626             
                                            --------        -----           -------        ------             
  Receivables                                                                                               
    Employer's contribution..............        412           --                51             9             
    Participants' contributions..........        662           --               109            11             
    Accrued interest and dividends.......         --           --                --            --             
                                            --------        -----           -------        ------             
      Total receivables..................      1,074           --               160            20             
                                            --------        -----           -------        ------             
Net assets available for benefits........   $354,140        $  --           $58,503        $5,646             
                                            ========        =====           =======        ======             
</TABLE>
 
                                        3
<PAGE>   5
<TABLE>
<CAPTION>
                                                                      TEMPLETON                                   
                                            FRANKLIN       PUTNAM     DEVELOPING    T. ROWE PRICE                 
                                            SMALL CAP      VOYAGER     MARKETS        DIVIDEND       PARTICIPANTS'
                                          GROWTH FUND I    FUND A      TRUST I       GROWTH FUND     LOAN ACCOUNT 
                                          -----------    ---------    -------------    -------------    ----------- 
DECEMBER 31, 1997                                                                                                   
- -------------------------------------------------------------------------------------------------------------------|
<S>                                        <C>            <C>           <C>              <C>          <C>
Assets:                                  
  Investments at market value............  $1,245         $800          $1,641           $--          $1,806,888
                                           ------         ----          ------           ---          ----------
  Receivables                                                                                                 
    Employer's contribution..............       9            9              --            --                  --
    Participants' contributions..........       2            2               3            --                  --
    Accrued interest and dividends.......      --           --              --            --               1,223
                                           ------         ----          ------           ---          ----------
      Total receivables..................      11           11               3            --               1,223
                                           ------         ----          ------           ---          ----------
Net assets available for benefits........  $1,256         $811          $1,644           $--          $1,808,111
                                           ======         ====          ======           ===          ==========
                                           
</TABLE>
 
                                        4
<PAGE>   6
 
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
           STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
 
<TABLE>
<CAPTION>
                                                                       MERCK COMMON STOCK FUND
                                                                   --------------------------------
                                                                       (NON-                                           FIDELITY
                                                                    PARTICIPANT      (PARTICIPANT     T. ROWE PRICE     EQUITY-
                                                                   DIRECTED; SEE     DIRECTED; SEE      BLUE CHIP       INCOME
                                                      TOTAL           NOTE 1)           NOTE 1)        GROWTH FUND       FUND
                                                 ---------------   --------------   ---------------   -------------   -----------
FOR THE PERIOD FROM INCEPTION (JULY 1, 1997)
THROUGH DECEMBER 31, 1997
- -----------------------------------------------                                                       |--------------------------
<S>                                              <C>               <C>              <C>               <C>             <C>
Additions to net assets attributed to:
  Investment income (loss)
    Net appreciation (depreciation) in market
      value of investments.....................  $       497,471   $      144,908   $       276,201     $ 45,566       $ 13,436
    Interest...................................           90,344           37,620            43,011        3,698            307
    Dividends..................................          230,633           57,845           116,314        3,260          9,992
                                                 ---------------   --------------   ---------------     --------       --------
      Total investment income (loss)...........          818,448          240,373           435,526       52,524         23,735
                                                 ---------------   --------------   ---------------     --------       --------
  Contributions to the Plan
    By participants............................        1,702,782               --         1,331,647       65,268          8,323
    By the employer............................          446,686          438,430             5,299          672            340
                                                 ---------------   --------------   ---------------     --------       --------
      Total contributions......................        2,149,468          438,430         1,336,946       65,940          8,663
                                                 ---------------   --------------   ---------------     --------       --------
      Total additions..........................        2,967,916          678,803         1,772,472      118,464         32,398
                                                 ---------------   --------------   ---------------     --------       --------
Deductions from net assets attributed to:
  Benefits paid to participants................       (1,599,902)        (334,772)       (1,102,686)     (47,686)        (2,810)
                                                 ---------------   --------------   ---------------     --------       --------
Transfers among funds and Plans:
  Transfers in from Merck & Co., Inc.
    Employee Savings and Security Plan (see
    Note 1)....................................       23,594,404        6,714,884        13,441,758      492,343        225,944
  Net reallocations............................               --               --            (2,560)      (2,455)        16,010
  Loans to participants........................               --         (238,916)         (236,763)      (4,595)          (341)
  Loan repayments by participants..............               --          204,514           194,152       16,915          2,513
                                                 ---------------   --------------   ---------------     --------       --------
      Net transfers among funds and Plans......       23,594,404        6,680,482        13,396,587      502,208        244,126
                                                 ---------------   --------------   ---------------     --------       --------
      Total deductions and net transfers
        among funds and Plans..................       21,994,502        6,345,710        12,293,901      454,522        241,316
                                                 ---------------   --------------   ---------------     --------       --------
        Net increase...........................       24,962,418        7,024,513        14,066,373      572,986        273,714
Net assets available for benefits
        Beginning of period....................               --               --                --           --             --
                                                 ---------------   --------------   ---------------     --------       --------
        End of period..........................  $    24,962,418   $    7,024,513   $    14,066,373     $572,986       $273,714
                                                 ===============   ==============   ===============     ========       ========
</TABLE>
 
  The accompanying notes to financial statements are an integral part of this
                              financial statement.
 
                                        5
<PAGE>   7
<TABLE>
<CAPTION>                                      
                                                                FIDELITY                                                     
                                                  VANGUARD      GROWTH &     T. ROWE PRICE    T. ROWE PRICE    EUROPACIFIC   
                                                 U.S. GROWTH     INCOME       NEW INCOME         MID-CAP         GROWTH      
                                                  PORTFOLIO     PORTFOLIO        FUND          GROWTH FUND        FUND       
                                                 -----------    ---------    -------------    -------------    -----------   
FOR THE PERIOD FROM INCEPTION (JULY 1, 1997)   
THROUGH DECEMBER 31, 1997                      
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>           <C>             <C>               <C>             <C>
Additions to net assets attributed to:         
  Investment income (loss)                     
    Net appreciation (depreciation) in market  
      value of investments.....................  $  2,876      $ 10,748        $   250         $ 11,489        $(10,042) 
    Interest...................................       376         1,352             39              763             794  
    Dividends..................................     4,360        12,526            399            1,281           4,620  
                                                 --------      --------        -------         --------        --------  
      Total investment income (loss)...........     7,612        24,626            688           13,533          (4,628) 
                                                 --------      --------        -------         --------        --------  
  Contributions to the Plan                      
    By participants............................    16,201       111,973          1,953           24,284          18,511  
    By the employer............................       105           387              9              139             413  
                                                 --------      --------        -------         --------        --------  
      Total contributions......................    16,306       112,360          1,962           24,423          18,924  
                                                 --------      --------        -------         --------        --------  
      Total additions..........................    23,918       136,986          2,650           37,956          14,296  
                                                 --------      --------        -------         --------        --------  
Deductions from net assets attributed to:          
  Benefits paid to participants................    (5,457)      (19,643)           (58)         (14,385)         (8,630) 
                                                 --------      --------        -------         --------        --------  
Transfers among funds and Plans:                 
  Transfers in from Merck & Co., Inc.            
    Employee Savings and Security Plan (see      
    Note 1)....................................   101,326       209,311          9,761          107,238          86,596  
  Net reallocations............................    (7,179)        9,843             --           (4,139)         (3,348) 
  Loans to participants........................      (956)      (21,945)          (580)          (3,032)           (685) 
  Loan repayments by participants..............     1,289         4,297            106            2,001           2,975  
                                                 --------      --------        -------         --------        --------  
      Net transfers among funds and Plans......    94,480       201,506          9,287          102,068          85,538  
                                                 --------      --------        -------         --------        --------  
      Total deductions and net transfers         
        among funds and Plans..................    89,023       181,863          9,229           87,683          76,908  
                                                 --------      --------        -------         --------        --------  
        Net increase...........................   112,941       318,849         11,879          125,639          91,204  
Net assets available for benefits                
        Beginning of period....................        --            --             --               --              --  
                                                 --------      --------        -------         --------        --------  
        End of period..........................  $112,941      $318,849        $11,879         $125,639        $ 91,204  
                                                 ========      ========        =======         ========        ========

<CAPTION>
                                                   THE GEORGE      FIDELITY       FIDELITY        SPARTAN       FIDELITY  
                                                     PUTNAM       RETIREMENT     RETIREMENT     U.S. EQUITY    LOW-PRICED
                                                    FUND OF         MONEY        GOVERNMENT        INDEX         STOCK           
                                                    BOSTON A        MARKET      MONEY MARKET       FUND          FUND             
                                                  ----------      ----------    ------------     -----------   ----------          
FOR THE PERIOD FROM INCEPTION (JULY 1, 1997)   
THROUGH DECEMBER 31, 1997                                               (PARTICIPANT DIRECTED; SEE NOTE 1)              
- -------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>            <C>            <C>            <C>            <C>       
Additions to net assets attributed to:         
  Investment income (loss)                     
    Net appreciation (depreciation) in market    
      value of investments.....................   $ (1,305)      $     --       $    --        $ 4,068        $  (12)
    Interest...................................        645            963           619            122             7 
    Dividends..................................     10,353          8,440           300            620           126 
                                                  --------       --------       -------        -------        ------ 
      Total investment income (loss)...........      9,693          9,403           919          4,810           121 
                                                  --------       --------       -------        -------        ------ 
  Contributions to the Plan                      
    By participants............................     13,966         46,940        50,787         10,497           462 
    By the employer............................        105            412            --            348             9 
                                                  --------       --------       -------        -------        ------ 
      Total contributions......................     14,071         47,352        50,787         10,845           471 
                                                  --------       --------       -------        -------        ------ 
      Total additions..........................     23,764         56,755        51,706         15,655           592 
                                                  --------       --------       -------        -------        ------ 
Deductions from net assets attributed to:        
  Benefits paid to participants................    (11,342)       (32,318)       (2,468)       (11,371)           -- 
                                                  --------       --------       -------        -------        ------ 
Transfers among funds and Plans:                 
  Transfers in from Merck & Co., Inc.            
    Employee Savings and Security Plan (see      
    Note 1)....................................    121,190        305,070            --         40,069            -- 
  Net reallocations............................     (1,947)        25,087       (50,134)        13,940         5,000 
  Loans to participants........................       (455)        (5,241)         (268)          (422)           -- 
  Loan repayments by participants..............      2,999          4,787         1,164            632            54 
                                                  --------       --------       -------        -------        ------ 
      Net transfers among funds and Plans......    121,787        329,703       (49,238)        54,219         5,054 
                                                  --------       --------       -------        -------        ------ 
      Total deductions and net transfers          
        among funds and Plans..................    110,445        297,385       (51,706)        42,848         5,054 
                                                  --------       --------       -------        -------        ------ 
        Net increase...........................    134,209        354,140            --         58,503         5,646 
Net assets available for benefits              
        Beginning of period....................         --             --            --             --            -- 
                                                  --------       --------       -------        -------        ------ 
        End of period..........................   $134,209       $354,140       $    --        $58,503        $5,646 
                                                  ========       ========       =======        =======        ====== 
</TABLE>                                       
<PAGE>   8
<TABLE>
<CAPTION>
                                                 
                                                 
                                                                             TEMPLETON                                   
                                                   FRANKLIN       PUTNAM     DEVELOPING    T. ROWE PRICE                 
                                                   SMALL CAP      VOYAGAR     MARKETS        DIVIDEND       PARTICIPANTS'
                                                 GROWTH FUND I    FUND A      TRUST I       GROWTH FUND     LOAN ACCOUNT 
                                                 -------------    --------   ----------     ------------    ------------
FOR THE PERIOD FROM INCEPTION (JULY 1, 1997)
THROUGH DECEMBER 31, 1997
- -------------------------------------------------------------------------------------------------------------------------|
<S>                                              <C>               <C>        <C>           <C>             <C>
Additions to net assets attributed to:
  Investment income (loss)
    Net appreciation (depreciation) in market
      value of investments.....................    $  (72)        $(26)       $ (614)       $     --        $       --
    Interest...................................        --            7            21              --                --
    Dividends..................................        50           39           108              --                --
                                                   ------         ----        ------        --------        ----------
      Total investment income (loss)...........       (22)          20          (485)             --                --
                                                   ------         ----        ------        --------        ----------
  Contributions to the Plan                                                                                           
    By participants............................       709          728           533              --                --
    By the employer............................         9            9            --              --                --
                                                   ------         ----        ------        --------        ----------
      Total contributions......................       718          737           533              --                --
                                                   ------         ----        ------        --------        ----------
      Total additions..........................       696          757            48              --                --
                                                   ------         ----        ------        --------        ----------
Deductions from net assets attributed to:                                                                             
  Benefits paid to participants................        --           --            --              --            (6,276)
                                                   ------         ----        ------        --------        ----------
Transfers among funds and Plans:                                                                                      
  Transfers in from Merck & Co., Inc.                                                                                 
    Employee Savings and Security Plan (see                                                                           
    Note 1)....................................        --           --            --              --         1,738,914
  Net reallocations............................       560           --         1,322              --                --
  Loans to participants........................        --           --            --              --           514,199
  Loan repayments by participants..............        --           54           274              --          (438,726)
                                                   ------         ----        ------        --------        ----------
      Net transfers among funds and Plans......       560           54         1,596              --         1,814,387
                                                   ------         ----        ------        --------        ----------
      Total deductions and net transfers                                                                              
        among funds and Plans..................       560           54         1,596              --         1,808,111
                                                   ------         ----        ------        --------        ----------
        Net increase...........................     1,256          811         1,644              --         1,808,111
Net assets available for benefits                                                                                     
        Beginning of period....................        --           --            --              --                --
                                                   ------         ----        ------        --------        ----------
        End of period..........................    $1,256         $811        $1,644        $     --        $1,808,111
                                                   ======         ====        ======        ========        ==========
</TABLE>
 
 
                                        7
<PAGE>   9
 
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                         NOTES TO FINANCIAL STATEMENTS
 
 1. DESCRIPTION OF THE PLAN:
 
     The Merck Puerto Rico Employee Savings and Security Plan (the "Plan") is a
profit sharing plan designed to provide an opportunity for employees of Merck
Sharp & Dohme Quimica de Puerto Rico, Inc. and Merck Sharp & Dohme (I.A.) Corp.
(the "Companies") to become stockholders of Merck & Co., Inc. ("Merck") and to
encourage them to save on a regular basis by setting aside part of their
earnings. The Plan was adopted effective July 1, 1997, as a result of a spin-off
from the Merck & Co., Inc. Employee Savings and Security Plan. A transfer of
$23,594,404 of assets was made into the Plan as a result of the spin-off.
Regular full-time and part-time employees of the Companies, as defined in the
Plan document, who have completed at least one year of employment and are not
covered by a collective bargaining agreement, are eligible to enroll in the
Plan.
 
     The Plan is administered by the Employee Benefits Committee appointed by
the President of the Companies. All costs of administering the Plan are borne by
the Companies.
 
     Participants should refer to the Summary Plan Description for a complete
description of benefits provided.
 
     CONTRIBUTIONS
 
     Participants may contribute from 2% up to 15% of their base pay, provided
that pre-tax contributions shall not exceed 10% of base compensation. In
addition, the Companies match 50% of employee contributions up to 5% of base pay
per pay period. The Companies' matching contributions are invested entirely in
the Merck Common Stock Fund (Non-participant directed) and may not be
reallocated into any other investment option.
 
     INVESTMENT OPTIONS
 
     Participants direct the investment of their contributions into any
investment option including the Merck Common Stock Fund (Participant directed).
The following is a brief description of each option:
 
     Merck Common Stock Fund
 
     The Merck Common Stock Fund invests primarily in Merck common stock and a
small portion of money market instruments for liquidity. This liquidity allows
for daily trading in the fund. Ownership is measured in units rather than
shares. An investment in this option allows the participant to become a
stockholder and part owner of Merck. The value of the investment can go up or
down depending on general factors affecting the stock market and specific
factors affecting Merck's business. This is neither a mutual fund nor a
diversified or managed investment option. Investing in a non-diversified single
stock involves more investment risk than investing in a diversified fund.
 
     T. Rowe Price Blue Chip Growth Fund
 
     The T. Rowe Price Blue Chip Growth Fund seeks to provide long-term growth
of capital. The fund invests primarily (at least 65% of its assets) in common
stocks of large and medium-sized blue chip companies that have the potential for
above-average earnings growth and are well established in their respective
industries. The fund may also invest in convertible stocks and bonds, preferred
stocks, bonds and warrants. Up to 20% of assets (excluding reserves) may be
invested in foreign securities, which may be subject to currency risks and
political and sovereign risks of the home country.
 
                                        8
<PAGE>   10
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Fidelity Equity-Income Fund
 
     Funds are invested in income-producing equity securities. Normally, at
least 65% of the fund's assets will be invested in income producing equity
securities. The fund has the flexibility to invest the balance in all types of
domestic and foreign securities, including bonds.
 
     Vanguard U.S. Growth Portfolio
 
     Vanguard U.S. Growth Portfolio seeks to provide long-term capital growth by
investing in equity securities of large, established U.S. companies that have
good growth records, strong market positions and have exhibited long-term
financial strength to provide potential long-term growth.
 
     Fidelity Growth & Income Portfolio
 
     Funds are invested primarily in U.S. and foreign stocks, focusing on those
that pay current dividends and offer potential growth of earnings such as common
stocks, convertible securities, preferred stocks and warrants.
 
     T. Rowe Price New Income Fund
 
     The T. Rowe Price New Income Fund is a bond fund that seeks to provide the
highest level of income consistent with preservation of capital by purchasing
securities that have been rated as investment-grade by Standard & Poor's,
Moody's or Fitch Investor Services. The fund invests at least 80% of its assets
in income-producing investment-grade debt securities including U.S. government
and agency securities, corporate bonds, bank obligations and utilities. The
fund's dollar-weighted average maturity is generally expected to be between four
and fifteen years.
 
     T. Rowe Price Mid-Cap Growth Fund
 
     The T. Rowe Price Mid-Cap Growth Fund seeks to provide long-term capital
appreciation by investing primarily in the stock of medium-sized (mid-cap)
growth companies that offer the potential for above-average earnings growth. The
fund focuses on companies that are no longer considered new or emerging, but are
well-established. It may also invest in convertible securities, warrants and
foreign securities, which are subject to greater risks.
 
     EuroPacific Growth Fund
 
     This fund seeks long-term capital growth by investing primarily in
securities of companies outside the United States. Normally, at least 65% of the
fund's total assets will be invested in Europe or the Pacific Basin. The Pacific
Basin is generally defined as those countries bordering the Pacific Ocean and
includes, but is not limited to Australia, Canada, Japan, Malaysia and
Singapore. The fund may also invest in convertible securities, debt and
government securities and preferred stock. Foreign investments, especially in
developing countries, involve greater risks and may offer greater potential.
 
     The George Putnam Fund of Boston A
 
     This fund seeks to provide a balanced investment comprised of a
well-diversified portfolio of stocks and bonds that will produce both capital
growth and current income. Normally, no more than 75% of the fund's assets will
be invested in common stocks and convertible securities.
 
                                        9
<PAGE>   11
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Fidelity Retirement Money Market
 
     Funds are invested in high-quality U.S. dollar-denominated money market
instruments of U.S. and foreign issuers. Normally, the fund intends to invest
more than 25% of its total assets in obligations of institutions in the
financial services industry.
 
     Fidelity Retirement Government Money Market
 
     Funds are invested in obligations issued or guaranteed as to principal and
interest by the U.S. government, its agencies or instrumentalities and in
repurchase agreements secured by these obligations. An investment in the
portfolio is not insured or guaranteed by the U.S. government.
 
     This investment option was eliminated from the plan effective July 1, 1997.
 
     Spartan U.S. Equity Index Fund
 
     Funds are primarily invested in securities of the companies which comprise
the S&P 500 Index. Effective April 18, 1997, the fund name was changed from
Fidelity U.S. Equity Index Portfolio to the Spartan U.S. Equity Index Fund.
 
     Fidelity Low-Priced Stock Fund
 
     This fund seeks capital appreciation by investing mainly in low-priced
domestic and foreign common stocks ($35 or less at time of purchase). Foreign
securities may involve a higher degree of risk. This fund charges a redemption
fee to discourage short-term buying and selling of fund shares. If fund shares
are sold after being held for less than 90 days, the fund will deduct a
redemption fee from participants' accounts equal to 1.5% of the value of the
shares sold.
 
     Franklin Small Cap Growth Fund I
 
     This fund seeks long-term capital growth by investing primarily in stocks
of companies with market capitalization of less than $1 billion at the time of
the investment. The fund tries to invest at least one-third of its assets in
stocks of companies with market capitalization of $550 million or less. Although
the fund's assets are invested primarily in small companies, it may invest up to
35% of its total assets in larger capitalized companies with strong growth
potential, in relatively well-known larger companies in mature industries with
potential for capital appreciation, or in corporate debt securities, including
bonds, notes and debentures if deemed appropriate. The fund may also invest up
to 25% of its total assets in foreign securities, which may involve greater
risks.
 
     Putnam Voyager Fund A
 
     This fund seeks capital appreciation by investing primarily in common
stocks of companies that have potential for capital appreciation which is
significantly greater than that of the market averages. The fund may also invest
in convertible bonds, convertible preferred stocks, warrants, preferred stocks,
money market instruments and debt securities. The fund may invest up to 20% of
its total assets in securities principally traded in foreign markets. Foreign
securities are subject to currency, political, financial or sovereign risks of
the issuer's home country.
 
                                       10
<PAGE>   12
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Templeton Developing Markets Trust I
 
     This fund seeks long-term capitalization by investing in equity securities
of emerging market countries. The fund may invest up to 35% of its total assets
in debt securities, including bonds, notes, debentures, commercial paper,
certificates of deposit, time deposits and bankers' acceptances. Foreign
investments may involve greater risks.
 
     T. Rowe Price Dividend Growth Fund
 
     This fund seeks to provide increasing dividend income over time, long-term
capital appreciation and reasonable current income through investments primarily
in dividend-paying stocks. The fund may also invest in bonds and foreign
securities.
 
     VESTING
 
     Participants are immediately vested in their contributions, all Companies'
matching contributions, plus actual earnings thereon.
 
     PLAN TERMINATION
 
     Although they have not expressed any intent to do so, the Companies have
the right under the Plan to discontinue contributions at any time and to
terminate the Plan subject to the provisions of the Employee Retirement Income
Security Act of 1974.
 
     PARTICIPANTS' LOAN ACCOUNT
 
     Participants may borrow from their account balances with interest charged
at the prime rate plus 1%. Loan terms range from one to five years or up to
thirty years for the purchase of a primary residence. The minimum loan is $500
and the maximum loan is the lesser of $50,000 less the highest outstanding loan
balance during the one year period prior to the new loan application date, or
50% of the participant's account balance less any current outstanding loan.
Activity related to these borrowings is reflected in the Participants' Loan
Account column of the financial statements.
 
     BENEFITS
 
     Participants are entitled to receive automatic, voluntary, in-service
(which include hardship withdrawals), or mandatory distributions as provided in
the applicable Plan provisions.
 
 2. SUMMARY OF ACCOUNTING POLICIES:
 
     The financial statements of the Plan have been prepared on the accrual
basis of accounting. The investments of the Plan are stated at quoted market
value. Dividend income is recorded on the ex-dividend date. The net appreciation
(depreciation) in market value of investments is based on the beginning of the
year market value or value at the time of purchase during the year and is
included in the statement of changes in net assets available for benefits.
 
     USE OF ESTIMATES
 
     The financial statements are prepared in conformity with generally accepted
accounting principles and, accordingly, include amounts that are based on
management's best estimates and judgments. Actual results could differ from
these estimates.
                                       11
<PAGE>   13
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
 3. INCOME TAXES:
 
     The Plan obtained a tax determined letter from the Puerto Rico Department
of Treasury on February 18, 1998 indicating that it had been designed in
accordance with applicable sections of the Puerto Rico Internal Revenue Code of
1994 ("PRIRC"). The Plan sponsors believe that the Plan is designed and operated
in compliance with the PRIRC. The Plan sponsors also believe that the Plan is
designed and currently operated as a qualified plan under the Internal Revenue
Code. The Plan has not been amended since its inception on July 1, 1997. A
request for a favorable determination letter will be filed with the Internal
Revenue Service by mid-August 1998.
 
 4. PARTY-IN-INTEREST:
 
     All transactions of party-in-interest are set forth on the attached
schedule.
 
                                       12
<PAGE>   14
 
                                                           SCHEDULE I
                                                           EIN:  66-0288298
                                                           PLAN NO.:  061
 
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
          ITEM 27a -- SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
 
                               DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                NUMBER OF
                                                                SHARES AT
             NAME OF ISSUER AND TITLE OF ISSUE               CLOSE OF PERIOD         COST          CURRENT VALUE
             ---------------------------------               ---------------      -----------      -------------
<S>                                                          <C>                  <C>              <C>
Merck Common Stock Fund*....................................    1,152,781         $10,067,125       $20,970,307
T. Rowe Price Blue Chip Growth Fund.........................       23,650             528,579           571,614
Fidelity Equity Income Fund.................................        5,212             259,854           273,159
Vanguard U.S. Growth Portfolio..............................        3,925             110,360           112,653
Fidelity Growth & Income Portfolio..........................        8,349             307,540           318,090
T. Rowe Price New Income Fund...............................        1,306              11,609            11,848
T. Rowe Price Mid-Cap Growth Fund...........................        4,381             115,152           125,293
EuroPacific Growth Fund.....................................        3,495             100,350            90,947
The George Putnam Fund of Boston A..........................        7,446             135,408           133,881
Fidelity Retirement Money Market............................      353,065             353,065           353,066
Fidelity Retirement Government Money Market.................           --                  --                --
Spartan U.S. Equity Index Fund..............................        1,668              54,748            58,343
Fidelity Low-Priced Stock Fund..............................          224               5,638             5,626
Franklin Small Cap Growth Fund 1............................           54               1,317             1,245
Putnam Voyager Fund A.......................................           42                 827               800
Templeton Developing Markets Trust 1........................          127               2,255             1,641
T. Rowe Price Dividend Growth Fund..........................           --                  --                --
Participants' Loan Account (with interest ranging from 6.5%
  to 10.7%).................................................           --           1,806,888         1,806,888
                                                                                  -----------       -----------
        Total Investments...................................                      $13,860,715       $24,835,401
                                                                                  ===========       ===========
</TABLE>
 
- ---------------
* Denotes a party-in-interest to the Plan.
 
                                       13
<PAGE>   15
 
                                                           SCHEDULE II
                                                           EIN:  66-0288298
                                                           PLAN NO.:  061
 
                               MERCK PUERTO RICO
 
                       EMPLOYEE SAVINGS AND SECURITY PLAN
 
               ITEM 27d -- SCHEDULE OF REPORTABLE TRANSACTIONS(a)
 
                         FOR THE PERIOD FROM INCEPTION
                    (JULY 1, 1997) THROUGH DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                                                                    CURRENT
                                                                                                     VALUE
                                                        PURCHASE      SELLING       COST OF       OF ASSETS ON       NET
IDENTITY OF PARTY INVOLVED AND DESCRIPTION OF ASSETS      PRICE        PRICE         ASSET      TRANSACTION DATE     GAIN
- ----------------------------------------------------   -----------   ----------   -----------   ----------------   --------
<S>                                                    <C>           <C>          <C>           <C>                <C>
Merck Common Stock
    73 purchase transactions......................     $22,502,264   $       --   $22,502,264     $22,502,264      $     --
    36 sales transactions.........................              --    1,954,289     1,287,872       1,954,289       666,417
</TABLE>
 
- ---------------
(a) Reportable transactions are transactions that, individually or in the
    aggregate, exceed 5% of the Plan's net assets as of the beginning of the
    Plan year.
 
                                       14
<PAGE>   16
 
                                                                      EXHIBIT 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference of our report dated May 1, 1998 included in the financial
statements and exhibits required by Form 11-K Annual Report for the Merck Puerto
Rico Employee Savings and Security Plan into the previously filed Registration
Statements of Merck & Co., Inc. on Form S-8 (Nos. 33-21087, 33-21088, 33-36101,
33-40177, 33-51235, 33-53463, 33-64273, 33-64665, 333-23293 and 333-23295), on
Form S-4 (No. 33-50667) and on Form S-3 (Nos. 33-60322, 33-39349, 33-51785,
33-57421, 333-17045 and 333-36383). It should be noted that we have not audited
any financial statements of the Plan subsequent to December 31, 1997 or
performed any audit procedures subsequent to the date of our report.
 
                                            ARTHUR ANDERSEN LLP
 
San Juan, Puerto Rico
June 22, 1998


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