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Required information [The following information applies to the questions displayed below] Wamerwoods Company uses a perpetual inventory system. it entered into the following purchases and sales transactions for March. 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include 90 units from beginning inventory, 220 units from the March 5 purchase, 70 units from the March 18 purchase, and 110 units from the March 25 purchase. Note: Round weighted average cost per unit to two decimals and final answers to nearest whole dollar