(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 decimal places, eg. 125.) FIFO LIFO AVERAGE-COST Cost of goods sold $ $ $