How would you solve this and what would the answers be?

Sage Hill Inc. sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Sage Hill Inc's purchases of EZslide snowboards during September. During the same month, 100 EZslide snowboards were sold. Sage Hill Inc. uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Inventory 15 $110 $1,650 Sept. 1 Sept. 12 Sept. 19 Purchases 48 113 5,424 Purchases 53 114 6,042 Sept. 26 Purchases 24 115 2.760 Totals 140 $15,876 (a) Compute the ending inventory at September 30 using the FIFO, LIFO and average-cost methods. (Round average cost per unit to 3 decimal places, e.g. 125.153 and final answers to decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST The ending inventory at September 30 $ (b) Compute the cost of goods sold at September 30 using the FIFO, LIFO and average-cost methods. (Round average cost per unit to 3 decimal places, e.g. 125.153 and final answers to O decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST Cost of goods sold $