Pearl Corp. sells a snowboard, WhiteOut, that is popular with snowboard enthusiasts. Presented below is information relating to Pearl Corp.'s purchases of WhiteOut snowboards during September. During the same month, 120 WhiteOut snowboards were sold at $170 each. Pearl Corp. uses a periodic inventory system. (a) Compute the ending inventory at September 30 and cost of goods sold using the FIFO and LIFO methods