Please explain A,B & C

Zippy Shoe Co. uses a periodic inventory system. Zippy purchased 425 pairs of shoes at $62 each in June, 980 pairs in August at $64 each, and 620 pairs in December at $67 each. Zippy sold 1,855 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 Complete this question by entering your answers in the tabs below. Required A Required B Required C FIFO Cost of Goods Sold Ending Inventory