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, 102 EZslide snowboards were sold. Mather uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 12 $100 $ 1,200 Sept. 12 Purchases 45 103 4,635 Sept. 19 Purchases 50 104 5,200 Sept. 26 Purchases 20 105 2,100 Totals 127 $13,135 (a) Compute the ending inventory at September 30 using the FIFO, LIFO and average-cost methods. (Round average cost per unit to 3 decimal places, e. g. 125.153 and final answers to 0 decimal places, e. g. 125.) FIFO LIFO AVERAGE-COST The ending inventory at September 30 $Enter a dollar amount 13135 $Enter a dollar amount 13135 $Enter a dollar amount 103.425 (b) Compute the cost of goods sold at September 30 using the FIFO, LIFO and average-cost methods. (Round average cost per unit to 3 decimal places, e. g. 125.153 and final answers