Mercer Inc. is a retailer operating in British Columbia. Mercer uses the perpetual inventory method. Using the following information, compute the cost of ending inventory and the cost of goods sold for the month of January using LIFO inventory costing method. 3. Unit cost or selling price as applicable $15 Quantity Description Beginning inventory100 Purchases Sale Purchases Sale Purchase Date January 1 18 28 20 32 140 110 15 20 25 90 20