Zippy Shoe Co. uses a periodic inventory system. Zippy purchased 430 pairs of shoes at $68 each in June, 970 pairs in August at $70 each, and 620 pairs in December at $73 each. Zippy sold 1,900 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