Answer and Explanation:
The journal entries are shown below:
On Dec 3
Account receivable $515,600 Â
     To Sales revenue $515,600
(Being the sale of merchandise on account is recorded) Â
Cost of goods sold $320,500 Â
     To Inventory $320,500
(Being the cost of merchandise sold on account) Â
On Dec 8
Sales allowance $24,000 Â
   To Account receivable $24,000
On Dec 13
Cash (491600 × 97%) $476,852 Â
Sales discount $14,748 Â
     To Account receivable ($515,600  - $24,000)  $491,600
(Being the cash received is recorded)