2 of 7 View Policies Current Attempt in Progress REl sells snowboards. Assume the following information relates to REI's purchases of snowboards during Septe month, 105 snowboards were sold. REI uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 15 $80 $1,200 Sept. 12 Purchases 45 82 3,690 Sept. 19 Purchases 50 84 4,200 Sept. 26 Purchases 20 _ 85 1,700 Totals 130 _ $10,790_ (a) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round the average unit cost to 3