2021 2020 2019 2018 2017 Sales Cost of goods sold $ 78,000 63,000 $ 70,000 51,900 $ 58,000 36,600 $ 58,000 45,900 $ 50,000 30,000 Dollar amounts stated are in thousands. a. Compute trend percentages for the above items taken from the financial statements of Lopez Plumbing over a five-year period. Treat 2017 as the base year. b. State whether the trends are favorable or unfavorable. Complete this question by entering your answers in the tabs below. Required A Required B Compute trend percentages for the above items taken from the financial statements of Lopez Plumbing over a five-year period. Treat 2017 as the base year. (Round your answers to the nearest whole percent. i.e. 1.2345 as 123%.) Sales Cost of goods sold 2021 2020 2019 2018 2017 % % % % % % % % % %