4 Sandra's Boards sells a snowboard, Xpert, that is popular with snowboard enthusiasts. Information relating to Sandra's purchasesc Xpert snowboards during September is shown below. During the same month, 125 Xpert snowboards were sold. Sandra's uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 29 $95 $2,755 Sept. 12 Purchases 45 100 4,500 Sept. 19 Purchases 20 102 2,040 Sept. 26 Purchases 50 103 5,150 Totals 144 $14,445 (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 $ $