Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions Activities Units Sold at Retail Units Acquired at Cost 540 units@ $40 per unit 320 units@ $36 per unit 100 units@ $24 per unit Date Jan. 1 Beginning inventory Feb. 10 Purchase Mar. 13 Purchase Mar. 15 Sales Aug. 21 Purchase Sept. 5 Purchase Sept. 10 Sales 650 units@ $85 per unit 120 units@ $45 per unit 520 units@ $41 per unit 640 units@ $85 per unit 1,290 units Totals 1,600 units