Current Attempt in Progress REI sells snowboards. Assume the following information relates to REl's purchases of snowboards during September. During the same month, 107 snowboards were sold. REI uses a periodic inventory system. (a) Your answer is correct. 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.g. 125.) inventory at September 30 Attempts: 1 of 3 used b) Compute the cost of goods sold for the month using the FIFO, LIFO, and average-cost methods. (Round average cost per unit to 3 decimal places, e.g. 125.153 and final answers to 0 decimal places, e.g. 125.)