Splish Brothers sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Splish Brothers's purchases of EZslide snowboards during September. During the same month, 105 EZslide snowboards were sold. 5plish. Brothers uses a periodic inventory system. Compute the ending inventory at September 30 using the FIFO, LIFO and average-cost methods. Compute the cost of goods sold at September 30 using the FIFO, LIFO and average-cost methods