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. Units Sold at Retail Date March 1 Activities Beginning inventory Units Acquired at Cost 100 units March 5 Purchase 400 units March 9 Sales. March 18 March 25 March 29 Purchase Purchase Sales. 120 units 200 units @ $50 per unit @$55 per unit @$60 per unit @ $62 per unit 420 units $85 per unit Totals 820 units 160 units @ $95 per unit 580 units 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include 80- units from beginning inventory, 340 units from the March 5 purchase, 40 units from the March 18 purchase, and 120 units from the March 25 purchase. (Round weighted average cost per unit to 2 decimal places.) Gross Margin Sales Less: Cost of goods sold Gross profit FIFO LIFO Weighted Average Specific ID