Marin sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Mariris purchases of EZs bide snowboards during September. During the same month, 105 EZslide snowboards were sold. Marin uses a periodic inventory systert. Comsute the ending inventory at September 30 using the FIFO, LFO and average-cost methods. Compute the cost of goods sold at September 30 using the FIFO, LFO and average cont methods