(b) Compute the cost of goods sold at September 30 using the FIFO, LIFO and average-cost methods. (Round averoge cost per unit to 3 decimal places, e.s. 125.153 and final answers to 0 decimal places, e.g. 125.) Blue Spruce Corp. sells a snowboard, EZslide, that is popular with snowboard enthusiasts, Below is information relating to Blue Spruce Corp's purchases of EZslide snowboards during September. During the same month, 108 EZstide snowboards were sold. Elue Spruce Corp. uses a periodicinventory system. (a) Compute the ending inventory at September 30 ubing the FIFO. LIFO and average-cost methods. (Round average cost per unit to 3 decimal places, es. 125.153 and final answers to 0 decimal places, e.s. 125.)