Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, es. 125.153 and final answers to 0 decimal places, es. 125. b) Compute the cost of goods sold for the month using the FIFO, LIFO, and average cost methods. (Round averuge cost per unit to 3 decimal places, es, 125.153 and find answers to 0 decimal places, es. 125.) Compute the ending inventory at September 30 using FIFO, LIFO, and average-cost. (Round average cost per unit to 3 decimal places, es. 125.153 and final answers to 0 decimal places, es. 125. b) Compute the cost of goods sold for the month using the FIFO, LIFO, and average cost methods. (Round averuge cost per unit to 3 decimal places, es, 125.153 and find answers to 0 decimal places, es. 125.)