E7.4 (LO 2), AP Mather sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Mather's purchases of EZslide snowboards during September. During the same month, 105 EZslide snowboards were sold. Mather uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 15 $100 $ 1,500 Purchase 45 4,590 19 Purchase 50 104 26 Purchase 20 105 2,100 Total 130 $13,390 12 102 5,200 Instructions Compute the ending inventory at September 30 and the cost of goods sold using the FIFO, LIFO, and average-cost methods. Prove the amount allocated to cost of goods sold under each method