ration uses the perpetual inventory system. Calculate the value of ending inventory and cost of nventory Costing Methods-Perpetual Method Using the data below, assume that Port goods sold at year-end using the perpetual method and (a first-in, first-out, (b) last-in, first-out, and (c weighted-average cost method. Units Unit Cost $8 Beginning inventory, January 1 1.200 Purchases February 11 500 May 18 400 October 23 00 Sales: March 1 1,400 July 1 1,400 October 29 1,200