7- Practice Common-size and trend percentages for a company's net sales, cost of goods sold, and expenses follo Common-Size Percentages Trend Percentages 2020 Net sales 100.0% 2019 100.0% 2018 2020 2019 2018 100.0% 108.1% 106.5% 100.0% Cost of goods sold Expenses 60.9 35.3 59.2 31.9 55.4 33.5 116.2 112.1 112.2 100.0 105.0 100.0 Required: a. Calculate the profit percentage for 2018, 2019 and 2020. (Round the final answers to 2 decimal places.)