please help!!!

Question: under the lifo method, the cost of goods sold for each sale is:

During July, the following purchases and sales were made by Waterway Compary. There was no beginning irventory Waterway Company uses a perpetual inventory system. Under the LIFO method, the cost of goods sold for each sale is? July 13 July 22 $610$270 $650$324 $720$324 $660$297