REl sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same. month, 108 snowboards were sold. REl uses a periodic inventory system. (a) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost, (Round overage cost per unit to 3 decimal ploces, eg. 125.153 and final answers to 0 decimal places, es. 125.) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, eg. 125.153 and final answers to 0 decimal places, e8. 125.)