Huskies#1, Inc., recorded the following profit figures in 2020-2022.

a.	Compute the gross profit margin for 2020-2022.
b.	Describe the trend in profitability and pinpoint its causes.

Show all your work.

	2022	2021	2020
Net sales	$30,500	$25,600	$22,900
Costs and expenses:
Cost of products sold	$12,600	$10,300	$ 8,350
Selling	7,875	5,025	4,580
General	2,950	2,325	2,150
Research and development	4,100	3,190	2,840
	$27,525	$20,840	$17,920
Operating income	$ 2,975	$ 4,760	$ 4,980
Other income (expense)	525	(300)	(400)
Earnings before tax	$ 3,500	$ 4,460	$ 4,580
Income tax	1,480	1,990	2,100
Net income	$ 2,020	$ 2,470	$ 2,480