6) Prepare the journal entries for the transactions listed below under both the periodic inventory system and the perpetual inventory system. A. Purchased merchandise for cash, $1,000. B. Sold merchandise for $600 cash that had cost $480 (cost is 80% of the sales price). C. Accepted a sales return from a customer: sales price $30. A cash refund was given to the customer. The goods were returned to regular inventory. D. Returned goods to the vendor because they did not meet our specification; $50 cash refund was received.