In its first month of operations, Sandhill Company made three purchases of merchandise in the following sequence: (1) 800 units at $4, (2) 850 units at $6, and (3) 950 units at $7. Sandhill uses a periodic inventory system. (a1) Your answer is correct. Calculate k veighted-average unit cost. (Round answer to 3 decimal places, eg. 5.125.) Weighted-average unit cost Your answer is incorrect. Compute the cost of the ending inventory under the average-cost method, assuming there are 700 units on hand at the end of the period. (Round answer to 0 decimal places, e.g. 125.) Cost of the ending inventory