Common-size and trend percents for Rustynail Company?s sales, cost of goods sold, and expenses follow. Determine whether net income increased, decreased, or remained unchanged in this three-year period.

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Common-Size Percents Trend Percents 2018 2017 2018 2016 2016 2017 100.0% 100.0% 105.4% 113.1 59.1 106.8 15.1 104.2% 109.1 102.1 100.0% 100.0 100.0 100.0% Sales.. Cost of goods sold.. Total expenses. 63.4 61.9 14.8 15.3