Compute trend percentages for the following items taken from the financial statements of Lopez Plumbing over a five-year period. Treat 2017 as the base year. State whether the trends are favorable or unfavorable. (Dollar amounts are stated in thousands.)

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Sales.... Cost of goods sold .. 2021 2020 2019 2018 2017 $81,400 $74,000 $61,500 $59,000 $50,000 58,500 48,000 40,500 37,000 30,000