December 31, 2020, 2019, 2018 (in millions) 2020 Current assets $ 771 Other assets 2,425 Total assets $3,196 Current liabilities $ 589 Long-term liabilities 1,588 Stockholders' equity 1,019 Total liabilities and stockholders' equity $3,196 2019 $ 991 1,932 $2,923 $ 842 1,043 2018 $ 853 1,731 $2,584 $ 735 919 930 $ 2,584 - 1,038 $2,923 2019 WIPER INC. Selected Income Statement and Other Data For the year Ended December 31, 2020 and 2019 (in millions) 2020 Income statement data: Sales $3,062 Operating income Interest expense 96 Net income 227 Other data: Average number of common shares outstanding 42.5 Total dividends paid $ 62.0 $ 2,925 322 222 47.9 $ 53.5 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 13 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 parte. g. Calculate the dividend payout ratio for 2020. h. Assume that accounts receivable at December 31, 2020, totaled $321 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