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 57.0 14.3 13.8 14.1 Trend Percents 2017 2016 2015 104.2% 103.0% 100.0% 115.9 110.6 100.0 105.7 100.8 100.0 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 57,000 14,100 28.900 $ Did the net income increase, decrease, or remain unchanged in this three-year period