REI sells snowboards. Assume the following information relates to REi's purchases of snowboards during September. During the same month, 109 snowboards were sold. REl uses a periodic inventory system. (a) Compute the ending inventory at September 30 using FIFO. LIFO, and werage-cost ifound overage cost per init to 3 decimal places, es. 125.153 and final answers to 0 decimal places, es. 125)