Answer:
Sales of $113,400 ($99,000 on account)
Collections on account, $87,400.
Write-offs of uncollectible receivables, $1,760.
Recovery of receivable previously written off, $300.
Dr Accounts receivable 99,000
Dr Cash 14,400
 Cr Sales revenue 113,400
Dr Cash 87,400
 Cr Accounts receivable 87,400
Since we are assuming that the company uses the allowance method, we must first record bad debt expense:
Dr Bad debt 1,760
 Cr Allowance for uncollectible accounts 1,760
Then when we write off the account:
Dr Allowance for uncollectible accounts 1,760
 Cr Accounts receivable 1,760
To reverse a write off for recording the collection of an account:
Dr Accounts receivable 300
 Cr Allowance for doubtful accounts 300
Dr Cash 300
 Cr Accounts receivable 300