Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March. Date March 1 March 5 March 9 March 18. March 25 March 29 Activities Beginning inventory Purchase Units Acquired at Cost 100 units @ $50 per unit Units Sold at Retail 400 units @ $55 per unit Sales Purchase Purchase Sales 420 units $85 per unit Totals 120 units 200 units 820 units @ $60 per unit @$62 per unit 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. Note: 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