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The college campus bookstore uses a periodic inventory system. The bookstore purchases 425 copies of a textbook at $71 each in June, 950 copies in August at $73 each, and 620 copies in December at $76 each. The bookstore sold 1, 865 copies of the textbook during the year. Required: Calculate the company's ending inventory and cost of goods sold using the each of following inventory costing methods. a. FIFO b. LIFO c. Weighted Average cost method