Based on the percentage of the receivables that go to the allowance account and the accounts receivable balance, the bad debt expense is $24,000.
This is found as:
= (Accounts receivable balance x Percentage of receivables ) + (Amount written off - Credit balance on allowance account)
Solving gives:
= (300,000 x 8%) + (25,000 - 21,000)
= 24,000 + 4,000
= $28,000
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