REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 101 snowboards were sold. REI uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 10 $112 $1,120 Sept. 12 Purchases 50 115 5,750 Sept. 19 Purchases 57 116 6,612 Sept. 26: Purchases 21 117 2,457 Totals 138 $15,939 1 Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, eg. 125.153 and final answers to O decimal places, eg. 125.) Ending inventory at. September 30 FIFO LIFO AVERAGE-COST