In its first month of operations, Sheridan Company made three purchases of merchandise in the following sequence: (1) 300 units at $7,(2)450 units at $8, and (3)250 units at $9. (a) Calculate the average unit cost. (Round answer to 2 decimal places, es. 15.25.) Average unit cost Attempts: 0 of 1 used (b) Compute the cost of the ending inventory under the average-cost method, assuming there are 400 units on hand. (Round answer to Odecimal places, eg. 1,250.) The cost of the ending inventory