Sold merchandise for $5,400, with credit terms n/30; invoice dated april 1. the cost of the merchandise is $3,240. apr. 4 the customer in the april 1 sale returned $620 of merchandise for full credit. the merchandise, which had cost $372, is returned to inventory. apr. 8 sold merchandise for $2,200, with credit terms of 1/10, n/30; invoice dated april 8. cost of the merchandise is $1,540. apr. 11 received payment for the amount due from the april 1 sale less the return on april 4.