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Laura's Boards sells a snowboard, Xpert, that is popular with snowboard enthusiasts. Information relating to Laura's purchases of Xpert snowboards during September is shown below. During the same month, 120 Xpert snowboards were sold. Laura's uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 30 $97 $ 2,910 Sept. 12 Purchases 45 103 4,635 Sept. 19 Purchases 20 105 2,100 Sept. 26 Purchases 50 106 5,300 Totals 145 $14,945 (a) 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 $ $