Current Attempt in Progress REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 102 snowboards were sold. REl uses a periodic inventory system. (a) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, e.g. 125.153 and final answers to 0 decimal places, e.8. 125.)