please help

REl sells snowboards. Assume the following information relates to REl's purchases of snowboards during September. During the same month, 105 snowboards were sold. REl uses a periodic inventory system. (a) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round averoge cost per unit to 3 decimal places, e. 125.153 and final answers to 0 decimal ploces, eg. 125