Common-size and trend percents for rustynail company's sales, cost of goods sold, and expenses follow. common-size percents trend percents 2017 2016 2015 2017 2016 2015 sales 100.0 % 100.0 % 100.0 % 104.9 % 103.7 % 100.0 % cost of goods sold 63.2 61.0 58.0 114.3 109.1 100.0 total expenses 14.4 13.9 14.2 106.5 101.5 100.0 determine the net income for the following years. (enter all amounts as positive values.) did the net income increase, decrease, or remain unchanged in this three-year period? remained unchanged net income increased net income decreased