REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 105 snowboards were sold. REI uses a periodic inventory systein. Explanation Units Unit Cost Total Cost Date Sept. 1 Inventory 12 $110 $1,320 Sept. 12 Purchases 45 55 113 5,085 Sept. 19 Purchases 60 90 114 6,840 Sept. 26 Purchases 23 23 115 2.645 Totals 140 $15,890 (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 0 decimal places, eg. 125) Ending inventory at September 30 $ FIFO LIFO $ $ AVERAGE-COST