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6. We the North Inc. (WTN) provides the following information about their beginning inventory, purchases and sales during the year. The company uses a perpetual inventory system. Purchases Sales Number of Unit Number of Sales Date units Cost Units Price Jan.1 (beginning inventory) 750 $5.00 Jan.28 200 $8.00 Mar. 7 400 $5.50 Aug.28 $8.50 Sept.4 $5.60 Nov.12 $8.80 500 100 200 Required (24 marks) (Show all calculations and CLEARLY show your answer to EACH question): a) Calculate the cost of ending inventory using the weighted-average costing method. b) How many units are in ending inventory using the weighted average costing method? c) Calculate the cost of goods sold using the weighted-average costing method. d) Calculate the cost of ending inventory using the FIFO costing method. e) How many units are in ending inventory using the FIFO costing method? f) Calculate the cost of goods sold using the FIFO costing method