Common-size and trend percentages for a company's net sales, cost of goods sold, and expenses follow: Common-Size Percentages Trend Percentages Net sales 2020 100.0% 2019 100.0% 2018 2020 2019 2018 Cost of goods sold Expenses 56.4 27.0 54.3 23.6 100.0% 50.0 25.8 107.7% 106.2% 100.0% 115.4 110.7 100.0 108.1 103.4 100.0 Required: a. Calculate the profit percentage for 2018, 2019 and 2020. (Round the final answers to 2 decimal places.) Profit Percentage 2018 % 2019 % 2020 %