Sunland Medical manufactures hospital beds and other institutional furniture. The company's comparative balance sheet and income statement for 2019 and 2020 follow.

Sunland Medical

Comparative Balance Sheet

As of December 31

	2020	2019
Assets
Current assets
Cash	$398,000	$417,450.00
Accounts receivable, net	1,099,000	776,450
Inventory	746,000	681,000
Other current assets	381,350	247,000
Total current assets	2,624,350	2,121,900
Property, plant, & equipment, net	8,645,055	8,440,010
Total assets	$11,269,405	$10,561,910
Liabilities and Stockholders' Equity
Current liabilities	$3,209,000	$2,846,050
Long-Term debt	3,702,600	3,892,700
Total liabilities	6,911,600	6,738,750
Preferred stock, $5 par value	59,000	59,000
Common stock, $025 par value	104,650	103,850
Retained earnings	4,194,155	3,660,310
Total Stockholders' equity	4,357,805	3,823,160
Total liabilities and stockholders' equity	$11,269,405	$10,561,910

Sandhill Medical

Comparative Income Statement and Statement of Retained Earnings

For the Year

	2020	2019
sales revenue (all on account)	$10,177,250	$9,613,900
Cost of goods sold	5,612,700	5,298,700
Gross profit	4,564,550	4,315,200
Operating expenses	2,840,300	2,634,200
Net operating income	1,724,250	1,681,000
Intrest expense	300,400	308,700
Net income before taxes	1,423,850	1,372,300
Income taxes (30%)	427,155	411,690
Net Income	$997,695	$960,610
Dividends paid
Preferred dividends	29,550	29,550
Common dividends	433,350	413,050
Total dividends paid	462,900	442,600
Net income retained	534,845	518,010
Retained earnings, beginning of year	3,660,310	3,142,300
Retained earnings, end of year	$4,194,155	$3,660,310

Calculate the following profitability ratios for 2020

1. Gross margin percentage __________%
2. Return on assets______________%
3. Return on common stockholders' equity __________%