View Policies -/ 18 Current Attempt in Progress Sarah's Boards sells a snowboard, Xpert, that is popular with snowboard enthusiasts. Information relating to Sarah's purchases of Xpert snowboards during September is shown below. During the same month, 121 Xpert snowboards were sold. Sarah's uses a periodic inventory system. Date Units Unit Cost Total Cost 26 Explanation Inventory Purchases Purchases $97 $ 2,522 Sept. 1 Sept. 12 Sept. 19 Sept. 45 104 4,680 20 106 2.120 Purchases 50 107 5.350 Totals 141 $14.672 (a) Compute the ending inventory at September 30 and cost of goods sold using the FIFO and LIFO methods. DO