P5-8A Magna International Inc. is a leading global supplier of technologically advanced automotive components, systems, and modules. Selected financial information (in US$ millions) follows: Sales Cost of goods sold Profit (loss) Current assets Current liabilities 2011 $28,748 25,401 1,018 8,146 5,724 2010 $23,465 20,456 1,003 7,485 4,968 2009 $16,876 15,387 (453) 6,233 4,232 Instructions (a) Calculate the gross profit margin, profit margin, and current ratio for each year. (b) Comment on whether the ratios have improved or deteriorated over the three years. TAKING IT FURTHER Assume you are thinking about investing in Magna International Inc. What other information would be useful in assessing these ratios