Common-size and trend percentages for a companys net sales, cost of goods sold, and expenses follow:

	Common-Size Percentages						Trend Percentages
	2017		2016		2015		2017		2016		2015
Net sales	100.0	%	100.0	%	100.0	%	108.1	%	106.5	%	100.0	%
Cost of goods sold	57.9		54.8		51.6		115.9		112.0		100.0
Expenses	24.1		21.9		22.4		111.9		104.8		100.0

Required: a. Calculate the profit percentage for 2015, 2016 and 2017. (Round the final answers to 2 decimal places.)

	Profit Percentage
2015		%
2016		%
2017		%

b. Determine whether the companys profit increased, decreased, or remained unchanged during this three-year period.