Answer:
S/n Accounts titles Debit Credit
1. Cash[$151,300 - ($67,500*4%)] $148,600
 Sales Discounts ($67,500*4%) $2,700
 Accounts Receivable $151,300
2. Accounts Receivable $5,670 
 Allowance for Doubtful Accounts $5,670 
 Cash $5,670 
 Accounts Receivable $5,670
 
3. Allowance for Doubtful Accounts $24,800 
 Accounts Receivable $24,800 
 
4. Bad Debt Expense $15,430
 Allowance for Doubtful Accounts $15,430
Workings: 
$24,600 + $5,670 - $24,800 = $5,470
$20,900 - $5,470 =