a. The unadjusted balance of the Allowance for Doubtful Accounts of Johnston Supplies, Incorporated is a credit balance in the amount of $29,067 on July 31, 2022. Prepare the required adjusting entry to record Bad Debt Expense for the year. b. Johnston Supplies, Incorporated writes off $3,121 of uncollectible accounts on August 15, 2022. Prepare the required adjusting entry to record the write-off. c. Use a T-account to determine the account balance in the Allowance for Doubtful Accounts on August 15, 2022