Concept:The provision for bad debts is the amount set aside based on a given percentage of sundry debtors.Explanation:Sundry debtors =N20,000.Required provision rate =4%.So, provision for bad debts =4%×N20,000.This equals 1004×20,000=800.The existing provision of N500 is the opening balance; it is not deducted when computing the required provision.Therefore, the required provision for bad debts is N800.Answer:Option B: N800