Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March Units sold at Retail Unito Aequired at coat 100 units @ $50.00 per unit 400 units @ $55.00 per unit Date Activities Mar. 1 Beginning inventory Mar. 5 Purchase Mar. 9 Sales Mar. 18 Purchase Mar. 25 Purchase Mar. 29 Sales Totals 420 unito $85.00 per unit 120 units $60.00 per unit 200 units @ $62.00 per unit 160 units $95.00 per unit 500 units 820 units 4. Compute gross profit earned by the company for each of the four costing methods. For specific Identification, the Morch 9 sole 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.) FIFO LIFO Avg. Cost Spec.ID Gross Margin Sales Less: Cost of goods sold Gross profit