Inventory Costing Methods-Perpetual Method Using the data below, assume that Graham Corporation uses the perpetual inventory system. Calculate the value of ending inventory and cost of goods sold for the year using the perpetual method and (a) first.in, first-out, (b) last-in, first-out, and (c) weighted-average cost method. Units Unit Cost Beginning inventory, January 1,200 Purchases: February 11 1,500 May 18 1,400 October 23 1,100 March 1 July 1 1,400 October 29 1,000 Round the cost per unit to 3 decimal places and round your final answers to the nearest dollar. a. First-In, First-Out Ending Inventory S Cost of goods Sold b. Last In, First-Out Ending Inventory Cost of Goods Sold 5 Weighted Average Ending Inventory Cost of Goods Sold S