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

Ivanhoe Medical Comparative Balance Sheet As of December 31
		2020		2019
Assets
Current assets
Cash		$380,000		$417,500
Accounts receivable, net		1,035,000		776,500
Inventory		726,000		681,050
Other current assets		381,400		247,000
Total current assets		2,522,400		2,122,050
Property, plant, & equipment, net		8,738,625		8,439,845
Total assets		$11,261,025		$10,561,895
Liabilities and Stockholders Equity
Current liabilities		$3,201,000		$2,846,100
Long-term debt		3,702,650		3,892,600
Total liabilities		6,903,650		6,738,700
Preferred stock, $5 par value		58,900		58,900
Common stock, $0.25 par value		104,700		103,900
Retained earnings		4,193,775		3,660,395
Total stockholders equity		4,357,375		3,823,195
Total liabilities and stockholders equity		$11,261,025		$10,561,895

Ivanhoe Medical Comparative Income Statement and Statement of Retained Earnings For the Year
		2020		2019
Sales revenue (all on account)		$10,177,200		$9,613,900
Cost of goods sold		5,613,150		5,298,750
Gross profit		4,564,050		4,315,150
Operating expenses		2,840,250		2,634,150
Net operating income		1,723,800		1,681,000
Interest expense		300,400		308,650
Net income before taxes		1,423,400		1,372,350
Income taxes (30%)		427,020		411,705
Net income		$996,380		$960,645
Dividends paid
Preferred dividends		29,550		29,550
Common dividends		433,450		413,050
Total dividends paid		463,000		442,600
Net income retained		533,380		518,045
Retained earnings, beginning of year		3,660,395		3,142,350
Retained earnings, end of year		$4,193,775		$3,660,395

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		%