E6-3 Mather sells a snowboard, Below is information relating tember. inventory system. EZslide, that is popular with snowboard enthusiasts. to Mather's purchases of EZslide snowboards during Sep- is po purchases During the inventory syst same month, 102 EZslide snowboards were sold. Mather uses a periodic Sept. 1 Sept. 12 Purchases Sept. 19 Sept. 26 Purchases ate Explanation Units Unit Cost Total Cost 12 45 50 20 127 $100 103 104 105 $1,200 4,635 5,200 2,100 $13,135 Inventory Purchases Totals Instructions Compute the ending inventory at September 30 and the cost of goods sold using the FIFO, LIFO, and average-cost methods. (For average-cost, round the average unit cost to three decimal places.) Prove the amount allocated to cost of goods sold under each method