The following transactions occurred between the Decker Company and Mann Stores, Inc., during March: Mar. 8 Decker sold $14,000 worth of merchandise ($9,600 cost) to Mann Stores with terms of 2/10, n/30. 10 Mann Stores paid freight charges on the shipment from Decker Company, $500. 12 Mann Stores returned $2,000 of the merchandise ($1,600 cost) shipped on March 8. 17 Decker received full payment for the net amount due from the March 8 sale. 20 Mann Stores returned goods that had been billed originally at