Answer:
The Journal entries are as follows:
(i) On September 30,
Cash A/c ($6,000 + $300) Dr. $6,300
To Sales $6,000
To sales tax payable $300
(To record sales and 5% sales tax payable)
(ii) On September 30,
Cost of goods sold A/c Dr. $3,900
To merchandise inventory $3,900
(To transfer the cost to the finishing department)
(iii) On 15th October,
Sales tax payable A/c Dr. $300
To cash $300
(To record remittance of sales tax to the state government)