On March $12,$ Klein Company sold merchandise in the amount of $$7,800$ to Babson Company, with credit terms of $2/10,$ n$/30.$ The cost of the items sold is $$4,500.$ Klein uses the perpetual inventory system and the gross method of accounting for sales. On March $15,$ Babson returns some of the merchandise. The selling price of the merchandise is $$600$ and the cost of the merchandise returned is $$350.$ Babson pays the invoice on March $20$ and takes the appropriate discount. The amount that Klein receives from Babson on March $20$ is:

Group of answer choices

$$7,800.$

$$7,056.$

$$7,644.$

$$7,200.$

$$7,044.$