Concept:Provision for bad debts is adjusted to the required percentage of debtors, and only the change is charged to the profit and loss account.Explanation:Required new provision is 5% of debtors.5%×2600=1005×2600=130.Existing provision on 1/1/06 is 60.Additional provision needed is 130−60=70.This 70 is the amount charged to the profit and loss account.Answer:D. 70