Problem 2 (Trend Analysis) The following common size income statements are available for Zamboanga Corporation for the two years ended December 31, 2020 and 2021. 2021 2020 Sales 100% 100% Cost of Sales 55% 70% Gross profit on sales 45% 30% Operating expenses (including income tax expense) 20% 18% Net Income 25% 12% Trend percentage for sales are as follows: 2022 - 130% 2021 - 100% Required: What should be the trend percentage for gross profit on sales for 2021? Show the computation