Inventory Costing Methods-Perpetual Method Using the data below, assume that Portet Corporation uses the perpetual inventory system. Calculate the value of ending inventory and cost of goods sold at year-end using the perpetual method and (a) first-in, first-out, (b) ast-in, first-out, and (c) weighted-average cost method. Units Unit Cost Beginning Inventory, January1 1,200 Purchases February 11 500 May 18 1,400 10 October 23 1,100 14 March 1 Sales 1,400 July 1 1,400 October 29 1,200