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

WIPER INC.
Condensed Balance Sheets
December 31, 2020, 2019, 2018
(in millions)
	2020			2019			2018
Current assets	$	764		$	981		$	843
Other assets		2,424			1,931			1,730
Total assets	$	3,188		$	2,912		$	2,573
Current liabilities	$	588		$	841		$	734
Long-term liabilities		1,582			1,034			910
Stockholders equity		1,018			1,037			929
Total liabilities and stockholders' equity	$	3,188		$	2,912		$	2,573

WIPER INC.
Selected Income Statement and Other Data
For the year Ended December 31, 2020 and 2019
(in millions)
	2020			2019
Income statement data:
Sales	$	3,061		$	2,924
Operating income		307			321
Interest expense		95			76
Net income		224			219
Other data:
Average number of common shares outstanding		42.4			47.8
Total dividends paid	$	61.0		$	53.4

I need the information below:

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.