i need answers with explanation please

1. Khalid carried out a review of his remaining trade receivables before preparing his financial statements. The following information relating to his debtors was available: Khalid has the following policy for calculating the provision for doubtful debts: Required. a. Calculate the amount of provision for doubtful debts.at 30 September, 2016 b. Record the estimated bad debt Expense at the end of the accounting period if the unadjusted balance of AFDD was RO 600 debit