Exercise 6-04 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. Units 13 Date Sept. 1 Sept. 12 Sept. 19 Sept. 26 Unit Cost $115 118 49 Explanation Inventory Purchases Purchases Purchases Totals Total Cost $ 1,495 5,782 6,426 2,880 $16,583 119 120 24 140 3 (a) Compute the ending inventory at September 30 using the FIFO, LIFO and average-cost methods. (Round average cost per unit 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 $ $ (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 $