In its first month of operations, Vaughn Company made three purchases of merchandise in the following sequence: (1) 340 units at $ 6, (2) 410 units at $ 7, and (3) 250 units at $ 8. (a) Your answer is incorrect. Calculate the average unit cost. (Round answer to 2 decimal places, e.g. 15.25.) Average unit cost $ $ (b) Compute the cost of the ending inventory under the average-cost method, assuming there are 400 units on hand. (Round answer to 0 decimal places, e.g. 1,250.) The cost of the ending inventory $