Answer:
Debit  Bad debt expense   $3,500
Credit Allowance account  $3,500
Being entries to account for estimated uncollectible receivables as at 31 December.
Explanation:
credit sales = $345,000
trade receivables = $35,000
estimate of uncollectible receivables = $3,500
the necessary adjusting entries on 31 December
Debit  Bad debt expense   $3,500
Credit Allowance account  $3,500
Being entries to account for estimated uncollectible receivables as at 31 December.