Answer:
The journal entries are shown below:
Explanation:
According to the scenario, the journal entries for the given data are as follows:
(1). Jun.30 Â Bad Debt expense A/c Dr $12,800
          To Allowance for Doubtful A/c $12,800
          (Being the bad debt expense is recorded)
(2). July    Allowance for Doubtful A/c Dr $6,400
          To Accounts Receivable A/c $6,400
          (Being the customer balance written off is recorded)