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Inventory Costing Methods-Perpetual Method Using the data below, assume that Porter 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) last-in, first-out, and (c) weighted-average cost method. Units Unit Cost Beginning Inventory, January 1 1,200 $8 Purchases: February 11 1,500 9 May 18 1,400 12 October 23 1,100 14 Sales March 1 1,400 July 1 1,400 October 29 1,200 For weighted-average cost method, round the cost per unit to 3 decimal places and round your final answers to the nearest dollar. First-In, First-Out Ending Inventory $ Cost of goods Sold $ b. Last-In, First-Out Ending Inventory Cost of Goods Sold $ c. Weighted Average Ending Inventory Cost of Goods Sold $