EXHIBIT 12(A) AMOCO ARGENTINA OIL COMPANY ------------------------ STATEMENT SETTING FORTH COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (MILLIONS OF DOLLARS, EXCEPT RATIOS) SIX MONTHS YEAR ENDED DECEMBER 31, ENDED JUNE --------------------------------- 30, 1995 1994 1993 1992 1991 1990 ------------ ----- ----- ----- ----- ----- Determination of Income: Consolidated earnings before income taxes and minority interest..................... $52.6 $ 86 $ 110 $ 96 $ 195 $ 151 Fixed charges expensed by consolidated companies................................. 3.7 5 -- -- -- -- Adjustments for certain companies accounted for by the equity method.................. -- -- -- -- -- -- ----- ----- ----- ----- ----- ----- Adjusted earnings plus fixed charges......... $56.3 $ 91 $ 110 $ 96 $ 195 $ 151 ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- Determination of Fixed Charges: Consolidated interest on indebtedness (including interest capitalized).......... $ 3.7 $ 5 $-- $-- $-- $-- Consolidated rental expense representative of an interest factor..................... -- -- -- -- -- -- Adjustments for certain companies accounted for by the equity method.................. -- -- -- -- -- -- ----- ----- ----- ----- ----- ----- Total fixed charges.......................... $ 3.7 $ 5 $-- $-- $-- $-- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- Ratio of earnings to fixed charges........... 15.2 18.2 N/A N/A N/A N/A