REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 108 snowboards were sold. REI uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 11 $116 $1,276 Sept. 12 Purchases 48 119 5,712 Sept. 19 Purchases 60 120 7,200 Sept. 26 Purchases 21 121 2,541 Totals 140 $16,729 (a) 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.) FIFO Ending inventory at September 30 $ LIFO AVERAGE-COST $