The following merchandise transactions occurred in December. Both companies use a perpetual inventory system. Dec. 3 Riverbed Ltd. sold goods to Concord Corp. for $59,600, terms n/15, FOB shipping point. The inventory had cost Riverbed $31,600. Riverbed's management expected a return rate of 3% based on prior experience. 7 Shipping costs of $800 were paid by the appropriate company. 8 Concord returned unwanted merchandise to Riverbed. The returned merchandise has a sales price of $1,840, and a cost of $1,000. It was restored to inventory. 11 Riverbed received the balance due from Concord.