The following summarizes the aging of accounts receivable for Johnston Supplies, Inc. as of July 31, 2016: Number of Days Unpaid Total Accounts Receivable Historical % Uncollectible Not yet due $128,400 5% 1-30 days past due $91,100 10% 31-60 days past due $55,500 16% Over 60 days past due $33,700 33% Required: a. The unadjusted balance of the Allowance for Doubtful Accounts of Johnston Supplies, Inc. is a credit balance in the amount of $29,517 on July 31, 2016. Prepare the required adjusting entry to record Bad Debt Expense for the year. (If no entry is required for a transaction/event, select "No Journal Entry Required" in the first account field.)