Common-size and trend percents for Rustynail Company's sales, cost of goods sold, and expenses follow. Sales Cost of goods sold Operating expenses Common-Size Percents 2017 2016 2015 100.0% 100.0% 100.0% 63.4 61.2 56.9 14.4 13.9 14.2 Trend Percents 2017 2016 2015 104.9% 103.7% 100.0% 116.9 111.5 100.0 106.5 101.5 100.0 Determine the net income for the following years. (Enter all amounts as positive values.) 2017 2016 $ Sales Cost of Goods Sold Operating Expenses Net Income 2015 100,000 56,900 14,200 28,900 $ Did the net income increase, decrease, or remain unchanged in this three-year period? O Remained unchanged O Net income decreased O Net income increased