please solve the whole question

5. An entity sells domestic appliances such as washing machines. These goods retail at $500 each and are sold with a one-year guarantee. Under the terms of the guarantee if the machine needs to be repaired then the entity will do so at no charge to the customer. In the entity's experience 20% of machines sold do require some form of repair at an average cost of $50. The entity has sold 200 machines. You may assume that the repairs are performed one year after the sale and that the present value for $1 after 1 year at rate of 10% equals 0.909. Required (15 Marks): Calculate any provision required that arises under the guarantee