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Marlow Company uses a perpetual inventory system. During the year, it entered into the following purchases and sales transactions. Date Activities Jan. 1 Beginning inventory Feb. 10 Purchase Mar. 13 Purchase Mar. 15 Sales Aug. 21 Purchase Sept. 5 Purchase Sept. 10 Sales Totals Units Acquired at Cost 640 units @ $44 per unit 210 units@ $40 per unit 120 units @ $20 per unit 170 units @ $60 per unit 290 units @ $48 per unit. 1,430 units Units Sold at Retail 410 units @ $75 per unit 230 units @ $75 per unit 640 units