The Stilton Company has the following inventory and credit purchases during the fiscal year ended December 31, 2020. Beginning 528 units $89/unit Feb. 10 Aug. 21 270 units @ $86/unit 150 units @ $99/unit Stilton Company has two credit sales during the period. The units have a selling price of $149 per unit. Mar. 15 Sales 350 units Sept. 10 255 units Stilton Company uses a perpetual inventory system