Carla Vista Co. sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Carla Vista Co.s purchases of EZslide snowboards during September. During the same month, 109 EZslide snowboards were sold. Carla Vista Co. uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 13 $102 $ 1,326 Sept. 12 Purchases 46 105 4,830 Sept. 19 Purchases 54 106 5,724 Sept. 26 Purchases 21 107 2,247 Totals 134 $14,127 (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 $ 5724 $ $ (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 0 decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST Cost of goods sold $ $ $