(a) Your answer is correct. Compute the ending inventory at September 30 and cost of goods sold using the FIFO and LIFO methods. eTextbook and Media Solution (b) For both FIFO and LIFO, calculate the sum of ending inventory and cest of goods sold, 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 itonth. 120 Xpert snowboards were sold. Laura's uses a periodic inventory system