please help

REl sells snowboards. Assume the following information relates to REf's purchases of snowboards during September. During the same month, 100 snowboards were sold, REl uses a periodic inventory system. Compute the ending inventory at September 30 using FIFO, LIFO, and ivernge-cost, (Round overage cost per unit to 3 decimal places, es. 125.153 and final answers to 0 decimal ploces es. 125.)