need explanation on the lifo and fifo method please and thank you

Splish Brothers sells a snowboard, EZslide, that is popular with snowboard enthusiasts. The following is information relating to Splish Brothers's beginning inventory and purchases of EZslide snowboards during September. During the same month, 107 EZslide snowboards were sold. Splish Brothers uses a periodic inventory system. Compute the ending inventory at September 30 and the cost of goods sold using the FIFO, LIFO, and average-cost methods. (Round per unit cost to 3 decimal places, e.g. 15.647 and final answers to 0 decimal places, e.g. 5.125.)