Presented here are summarized data from the balance sheets and income statements of Wiper Inc.:

WIPER INC.Condensed Balance SheetsDecember 31, 2020, 2019, 2018(in millions)202020192018Current assets$813$1,051$913Other assets2,4311,9381,737Total assets$3,244$2,989$2,650Current liabilities$595$848$750Long-term liabilities1,6241,097964Stockholders' equity1,0251,044936Total liabilities and stockholders' equity$3,244$2,989$2,650

WIPER INC.Selected Income Statement and Other DataFor the year Ended December 31, 2020 and 2019(in millions)20202019Income statement data:Sales$3,068$2,931Operating income314328Interest expense10283Net income245240Other data:Average number of common shares outstanding43.148.5Total dividends paid$68.0$54.1

Required:

1. Calculate return on investment, based on net income and average total assets, for 2020 and 2019.
2. Calculate return on equity for 2020 and 2019.
3. Calculate working capital and the current ratio for each of the past three years.
4. Calculate earnings per share for 2020 and 2019.
5. If Wiper's stock had a price/earnings ratio of 11 at the end of 2020, what was the market price of the stock?
6. Calculate the cash dividend per share for 2020 and the dividend yield based on the market price calculated in parte.
7. Calculate the dividend payout ratio for 2020.
8. Assume that accounts receivable at December 31, 2020, totaled $327 million. Calculate the number of days' sales in receivables at that date.
9. Calculate Wiper's debt ratio and debt/equity ratio at December 31, 2020 and 2019.
10. Calculate the times interest earned ratio for 2020 and 2019.