(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.q. 12 FIFO LIFO AVERAGE-COST The ending inventory at September 30 (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.q. 12 FIFO LIFO AVERAGE-COST The ending inventory at September 30