Current assets Other assets Total assets Current liabilities Long-term liabilities Stockholders' equity Total liabilities and stockholders' equity Income statement data: Sales Operating income. Interest expense Net income Condensed Balance sneets December 31, 2020, 2019, 2018 (in millions) Other data: 2020 781 2,426 $3,207 WIPER INC. Selected Income Statement and Other Data For the year Ended December 31, 2020 and 2019 (in millions) Average number of common shares outstanding Total dividends paid $ $ 590 1,597 1,020 $3,207 2020 $3,063 309 97 230 42.6 $ 63.0 2019 $1,001 1,933 $2,934 $ 843 $ 736 928 931 $2,595 1,052 1,039 $2,934 2019 $2,926 323 78 225 2018 $ 863 1,732 $2,595 48.0 $ 53.6 Required: a. Calculate return on investment, based on net income and average total assets, for 2020 and 2019. b. Calculate return on equity for 2020 and 2019. c. Calculate working capital and the current ratio for each of the past three years. d. Calculate earnings per share for 2020 and 2019. e. If Wiper's stock had a price/earnings ratio of 10 at the end of 2020, what was the market price of the stock? f. Calculate the cash dividend per share for 2020 and the dividend yield based on the market price calculated in part e. g. Calculate the dividend payout ratio for 2020. h. Assume that accounts receivable at December 31, 2020, totaled $322 million. Calculate the number of days' sales in receivables at that date. i. Calculate Wiper's debt ratio and debt/equity ratio at December 31, 2020 and 2019. j. Calculate the times interest earned ratio for 2020 and 2019.