ett Discover Current Attempt in Progress Mary's Boards sells a snowboard, Xpert, that is popular with snowboard enthusiasts. Information relating to Mary's purchases of Xpert snowboards during September is shown below. During the same month, 121 Xpert snowboards were sold. Mary's uses a periodic inventory system Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory $2.470 Sept. 12 Purchases 4,500 Sept. 19 Purchases 2,040 Sept. 26 Purchases 5.150 Totals $14,160 Compute the ending inventory at September 30 and cost of goods sold using the FIFO and LIFO methods. FIFO LIFO The ending inventory at September 30 $ Cost of goods sold