Don Williams received a memo requesting that he complete a trend analysis of the following numbers using 2018 as the base year. Sales Gross profit Net income 2021 $340,000 180,000 70,000 2020 $400,000 240,000 90,000 2019 $420,000 340,000 40,000 2018 $500,000 400,000 50,000 Could you help Don with the request? (Round your answers to the nearest whole percent.) 2021 2020 2019 2018 Sales % % % % % Gross profit Net income 100 % 100 % 100 % %