Zippy Shoe Company uses a periodic inventory system. Zippy purchased 415 pairs of shoes at $69 each in June, 985 pairs in Augus at $71 each, and 650 pairs in December at $74 each. Zippy sold 1,860 pairs of shoes 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