Answer:
The Journal entries are as follows:
1.
(a) On July 15,
(i) Cash A/c     Dr. $10,400
To sales                  $10,000
To sales tax payable        $400
(To record sales)
(ii) Cost of goods sold A/c   Dr.  $5,000
To Inventory A/c                     $5,000   Â
(To record cost of goods sold)
(b) On August 1,
Sales tax payable A/c  Dr. $400
To cash                      $400
(To record payment of sales tax)
2.
(i) On November 3,
cash A/c       Dr. $300
To Unearned ticket revenue   $300
(To record revenue)
(ii) On November 20,
Unearned ticket revenue A/c  Dr. $50
To ticket revenue                   $50
(To record adjusting entry)