Shamrock sells a snowboard, Ezslide, that is popular with snowboard enthusiasts. Below is information relating to Shamrock's purchases of EZslide snowboards during September. During the same month, 105 EZslide snowboards were sold. Shamrock uses a periodic inventory system Date Sept. 1 12 19 26 Unit Cost $90 92 Explanation Inventory Purchase Purchase Purchase Total Units 15 45 50 20 130 Total Cost $1,350 4,140 4,700 1.900 $12,090 94 95 Compute the ending Inventory at September 30 using the FIFO, LIFO and average-cost methods. FIFO LIFO AVERAGE-COST $ $ $ Ending inventory at September 30 Compute the cost of goods sold at September 30 using the FIFO LIFO and average cost methods, FIFO LIFO AVERAGE-COST $ Cost of goods sold