Prepare journal entries to record each of the following sales transactions of a merchandising company. Show supporting calculations and assume a perpetual inventory system.

Apr. 1 Sold merchandise for $3,000, granting the customer terms of 2/10, EOM; invoice dated April 1. The cost of the merchandise is $1,800.

Apr. 4 The customer in the April 1 sale returned merchandise and received credit for $600. The merchandise, which had cost $360, is returned to inventory.

Apr. 11 Received payment for the amount due from the April 1 sale less the return on April 4.