Can not seen to figure these out

Sunland Co, began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Calculate the average cost per unit at July 1,6,11,14,21&27. (Round intermediote calculations to O decimal places and final answers to 3 decimal places es $105.501.) Determine the ending inventory under a perpetuat inventory system using (1) FIFO, (2) moving average cost, and (3) UFO. (Round average-cost per unit to 3 decimal places, es. 12.520 and final answer to 0 decimal places, eg. 1,250.)