Required information The following information applies to the questions displayed below. Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March Activities Units Sold at Retail Date Units Acquired at Cost 100 units $50.00 per unit 400 units $55.00 per unit 1 Beginning inventory Mar. 5 Purchase 9 Sales Mar. 18 Purchase Mar. 25 Purchase Mar. 420 units $85.00 per unit Mar. 120 units $60.00 per unit 200 units $62.00 per unit 160 units @ $95.00 per unit Mar. 29 Sales 820 units 580 units Totals 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, the March 9 sale consisted of 80 units from beginning inventory and 340 units from the March 5 purchase; the March 29 sale consisted of 40 units from the March 18 purchase and 120 units from the March 25 purchase. (Round weighted average cost per unit to two decimals.) Gross Margin FIFO LIFO Avg. Cost Spec. ID Sales Less: Cost of goods sold Gross profit