March 5 Beginning inventory Purchase Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March. Date March 1 Activities Units Acquired at Cost 230 units @ $53.60 per unit 290 units @ $58.60 per unit March 9 Sales March 18 Purchase March 25 Purchase 150 units @ $63.60 per unit 280 units @ $65.60 per unit March 29 Sales Totals 950 units 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include 130 units from beginning inventory, 260 units from the March 5 purchase, 110 units from the March 18 purchase, and 150 units from the March 25 purchase. Note: Round weighted average cost per unit to two decimals and final answers to nearest whole dollar. Gross Margin FIFO LIFO Weighted Average Specific ID Sales Less: Cost of goods sold Gross profit