Black Company purchased $7,000 worth of merchandise, terms n/30 from Hayes Company. The cost of the merchandise was $4,900. 10 Black returned $500 worth of goods to Hayes for full credit. The goods had a cost of $350 to Hayes. 12 Black paid the account in full. Instructions Prepare the journal entries to record these transactions in (a) Blacks records and (b) Hayes records. Assume use of the perpetual inventory system for both companies