3 of 6 0//2 REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 107 snowboards were sold. REI uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 15 $110 $1,650 Sept. 12 Purchases 49 113 5,537 Sept. 19 Purchases 51 114 5,814 Sept. 26 Purchases 25 115 2,875 Totals 140 $15,876 (a) X Your answer is incorrect. Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, e.g. 125.153 and final answers to 0 decimal places, eg. 125.) FIFO Ending inventory at September 30 LIFO $ AVERAGE-COST AVERAGE-COST (b) The parts of