Concept:Use the debtors control account to find the credit sales for the year.Discount received is ignored because it affects creditors, not debtors.Explanation:Opening debtors = ₦4,000Closing debtors = ₦1,500Cash received from debtors = ₦8,500Bad debts written off = ₦350Discount allowed = ₦500The debtors account equation is:Opening debtors + Sales = Cash received + Bad debts + Discount allowed + Closing debtorsMake Sales the subject:Sales = Cash received + Bad debts + Discount allowed + Closing debtors - Opening debtorsSales = 8,500+350+500+1,500−4,000Sales = ₦6,850Answer:The amount of sales for the year is ₦6,850.Correct option: A.