I tried this problem, but I am having difficulty can I get some help?

Problem 6-9A Wittmann Co. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Purchases Date July 1 July 11 July 14 July 21 July Unit Cost 6 July Units 125 27 Sales Units $122 75 175 $136 200 $147 125 125 Calculate the average cost per unit at July 1, 6, 11, 14, 21 & 27. (Round answers to 2 decimal places, e.g. $105.50.) Average cost for each unit $ July 1 July 6 July 1 1 $ July 1 4 $ July 2 1 $ July 2 7 $ $ LINK TO TEXT Determine the ending inventory under a perpetual inventory system using (1) FIFO, (2) movingaverage cost, and (3) LIFO. (Round average-cost per unit to 2 decimal places, e.g. 12.52 and final answer to 0 decimal places, e.g. 1,250.) MOVINGAVERAGE FIFO The ending inventory under a perpetual inventory system $ $ LINK TO TEXT Which costing method produces the highest ending inventory valuation? LINK TO TEXT LIFO $