Crane Medical manufactures hospital beds and other institutional furniture. The companys comparative balance sheet and income statement for 2019 and 2020 follow.

Crane Medical Comparative Balance Sheet As of December 31
		2020		2019
Assets
Current assets
Cash		$366,000		$417,400
Accounts receivable, net		1,080,000		776,450
Inventory		736,000		681,100
Other current assets		381,350		247,050
Total current assets		2,563,350		2,122,000
Property, plant, & equipment, net		8,666,440		8,440,015
Total assets		$11,229,790		$10,562,015
Liabilities and Stockholders Equity
Current liabilities		$3,169,000		$2,846,000
Long-term debt		3,702,600		3,892,700
Total liabilities		6,871,600		6,738,700
Preferred stock, $5 par value		59,000		59,000
Common stock, $0.25 par value		104,600		103,800
Retained earnings		4,194,590		3,660,515
Total stockholders equity		4,358,190		3,823,315
Total liabilities and stockholders equity		$11,229,790		$10,562,015

Crane Medical Comparative Income Statement and Statement of Retained Earnings For the Year
		2020		2019
Sales revenue (all on account)		$10,177,250		$9,613,950
Cost of goods sold		5,612,450		5,298,750
Gross profit		4,564,800		4,315,200
Operating expenses		2,840,200		2,634,100
Net operating income		1,724,600		1,681,100
Interest expense		300,350		308,650
Net income before taxes		1,424,250		1,372,450
Income taxes (30%)		427,275		411,735
Net income		$996,975		$960,715
Dividends paid
Preferred dividends		29,450		29,450
Common dividends		433,450		413,100
Total dividends paid		462,900		442,550
Net income retained		534,075		518,165
Retained earnings, beginning of year		3,660,515		3,142,350
Retained earnings, end of year		$4,194,590		$3,660,515

Calculate the following profitability ratios for 2020. (Round answers to 1 decimal place, e.g. 50.1%.)

a.	Gross margin percentage		%
b.	Return on assets		%
c.	Return on common stockholders equity		%