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The following information is available for Dahlia's Deli for three recent years: 2022 2021 2020 Sales $ 500,000 $ 490,000 $ 465,500 Cost of goods sold 325,000 323,400 316,540 Inventory 42,000 40,000 37,800 The ending inventory at December 31, 2019 was $ 36,000. Required: Calculate the inventory turnover, the days sales in inventory, and gross profit margin for Dalhia's Deli for each of the three years, and comment on any trends