Common-size and trend percents for Skelton Company’s sales, cost of goods sold, and expenses follow.

Determine whether net income increased, decreased, or remained unchanged in this three-year period.

Common-Size Percents Trend Percents 2009 2008 2007 2009 2008 2007 Sales . . . . . . . . . . . . . . . . . . 100.0% 100.0% 100.0% 105.4% 104.2% 100.0%
Cost of goods sold . . . . . . . 63.4 61.9 59.1 103.0 101.1 100.0 Total expenses . . . . . . . . . . . 15.3 14.8 15.1 95.0 91.0 100.0.AppendixLO1