Answer:
The Journal entries are as follows:
(a) On June 10,
Account Receivables A/c Dr. $6,300
To sales $6,300
(To record sale of merchandise)
(b) On June 12,
(i) Sales Return & allowance A/c Dr. $300
To Account Receivables $300
(Being Merchandise return by customer)
(ii) Merchandise Inventory A/c Dr. $70
To Cost of goods sold $70
(To record cost of merchandise returned)
(c) On June 19,
Cash A/c Dr. 5,940
Sales discount A/c Dr. 60
To Account Receivable $6,000
(Being Amount actually received on Credit sale after allowing discount)