Inventory Costing Methods-Perpetual Method The Glenn Sales Corporation uses the perpetual inventory system. On January 1, 2018, Glenn had 2,600 units of product B with a unit cost of $40 per unit. A summary of purchases and sales during 2018 follows: Unit Units Units Cost Purchased Sold 1,600 $44 3,000 Jan. 3 Mar. 8 June 13 Sept.19 Nov.23 2,000 46 800 50 1,200 Support Dec.28 1,800 Required a. Assume that Glenn uses the first-in, first-out method. Compute the cost of goods sold for 2018 and the ending inventory balance at December 31, 2018, for product B. b. Assume that Glenn uses the last-in, first-out method. Compute the cost of goods sold for 2018 and the ending inventory balance at December 31, 2018, for product B. c. Assume that Glenn uses the weighted average cost method. Compute the cost of goods sold for 2018 and the ending inventory balance at December 31, 2018, for product B. Do not round until your final answers. Round to the nearest dollar. 203,200 x 227,200 a. 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 $ 93,200 246,400 X 95,643 x 234,760