In its first month of operations, Sunland Company made three purchases of merchandise in the following sequence: (1) 380 units at $4, (2) 480 units at $6, and (3) 580 units at $7. Sunland uses a periodic inventory system. (a1) Your answer is correct. Calculate weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost $ 5,875 eTextbook and Media Attempts: 1 of 3 used (a2) Compute the cost of the ending inventory under the average-cost method, assuming there are 280 units on hand at the end of the period. (Round answer to O decimal places, e.g. 125.) Cost of the ending inventory.