4. Compute gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 decimal places.) Sales Less Cost of goods sold Gross profit FIFO LIFO Weighted Average Specific Identification $ 0 $ 0 $ 0 S 1 Problem 6-3A Perpetual: Alternative cost flows LO P1 Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions Date: Activities Jan. 1 Beginning inventory Feb. 10 Purchase Mar. 13 Purchase Mar. 15 Sales Aug. 21 Purchase i Sept. 5 Purchase Sept. 10 Sales Totals Units Acquired at Cost 600 units @ $40 per unit 400 units @ $37 per unit 190 units @ $15 per unit Units Sold at Retail 190 units @ $45 per unit 550 units @ $43 per unit 1,930 units 805 units @ $70 per unit 740 units @ $70 per unit 1,545 units