(a2) Compute the cost of the ending inventory under the average-cost method, assuming there are 390 units on hand. (Round answer to O decimal places, eg: 1,250.) The cost of the ending inventory $ In its first month of operations, Splish Brothers Inc. made three purchases of merchandise in the following sequence (1) 120 units at $9.(2) 510 units at $10.and (3) 150 units at $11