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% 63.7 61.5 56.3 14.2 13.7 14.0 Trend Percents 2017 2016 2015 103.9% 102.7% 100.0% 117.6 112.2 100.0 105.4 100.5 100.0 Determine the net income for the following years. (Enter all amounts as positive values.) 2017 2016 2015 Sales $ Cost of Goods Sold 100,000 56,300 14,000 29,700 Operating Expenses Net Income $ Did the net income increase, decrease, or remain unchanged in this three-year period? Remained unchanged Net income decreased Net income increased