on april 23, stilwell inc. sold $15,000 of merchandise to bosch inc. with terms 2/10, n/30. the cost of the merchandise sold was $9,000. on may 2, bosch inc. paid stilwell for the april 23 purchase less the discount. on may 11, bosch inc. returned merchandise to stilwell inc. and received a cash refund. the invoice amount of the returned merchandise was $2,500, and the merchandise originally cost stilwell inc. $1,300.