Pronghorn Corp sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Pronghorn Corp's purchases of EZslide snowboards during September. During the same month, 100 EZslide snowboards were sold. Pronghorn Corp 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 45 104 4,680 Sept. 26 Purchases 19 105 1.995 Totals 121 $12.510 (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 O decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST The ending inventory at September 30 $ $ (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 to o decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST Cost of goods sold