REl sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 100 snowboards were sold. REI uses a periodic inventory system. Date Explanation 'Units Unit Cost Total Cost Sept. 1 Inventory 13 $115 $ 1,495 Sept. 12 Purchases 49 118 5,782 Sept. 19 ^ Purchases 54 119 6,426 Sept. 26 Purchases 24 120 2,880 Totals 140 $16,583 Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost