Compute and Interpret Liquidity, Solvency and Coverage Ratios Balance sheets and income statements for Lockheed Martin Corporation follow. Refer to...

not sure why im getting some of these wrong. can someone help explain ?

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Compute and Interpret Liquidity, Solvency and Coverage RatiosBalance sheets and income statements for Lockheed Martin Corporation follow. Refer to these financialstatements to answer the requirements. Income Statement Year Ended December 31 (In millions) 2005 2004 2003 Net salesProducts :1; 31,518 $ 30,202 $ 27,290 Service 5,695 5,324 4,534 37,213 35,526 31,824 Cost of sales Products 27,892 27,667 25,306Service 5,073 4,765 4,099Unallocated coporate costs 803 914 443 33,768 33,346 29,848 3,445 2,180 1,976 Other income (expenses), net (449) (121) 43Operating profit 2,996 2,059 2,019Interest expense 370 425 487Earnings before taxes 2,626 1,634 1,532Income tax expense 801 368 479 Net earnings $1,825 $ 1,266 $1,053