Vertical analysis (common-size) percentages for Palau Company's sales revenue, cost of goods sold, and expenses are as follows. Vertical Analysis 2020 2019 2018 Sales revenue Cost of goods sold Expenses 56.5 60.9 100.0 % 100.0 % 100.0 % 65.5 21.2 22.9 27.8 Calculate the net income as a percent of sales for each year. (Round answers to 1 decimal place, es 12.5%) 2020 Net income 2019 2018 96 Did Palau's net income as a percent of sales increase, decrease, or remain unchanged over the 3- year period?