The following summarizes the aging of accounts receivable for Johnston Supplies, Inc. as of July 31, 2019 Historical t ollectible 28 12% 188 33% Total Accounts Not yet due 1-30 days past due 31-60 days past due Over 601days past due Receivable $126,900 89,600 54,000 32,200 Required: a. The unadjusted balance of the Allowance for Doubtful Accounts of Johnston Supplies, Inc. is a credit balance in the amount of b. Johnston Supplies, Inc. writes off $3,121 of uncollectible accounts on August 15, 2019. Prepare the required adjusting entry to record c. Use a T-account to determine the account balance in the Allowance for Doubtful Accounts on August 15, 2019. $29,067 on July 31,2019. Prepare the required adjusting entry to record Bad Debt Expense for the year. the write-off Complete this question by entering your answers in the tabs below Required ARequired B Required C The unadiusted halance of the Allowance for Douhtful Accounts of lohnston Sunnlies. Inc. is a credit halance in the amount atf