Emerald Co. uses a perpetual inventory system and records purchases of merchandise at net cost. The company recently purchased 420 compact discs at an invoice price of $6,000 and terms of 4/10, n/30. Half of these discs had been mislabeled and were returned immediately to the supplier. The journal entry to record payment of this invoice after the discount period has expired will include a:

Debit to an expense account for $120.

Debit to Inventory for $3,000.

Credit to Cash for $3,000.

Credit to Cash for $2,880.