5. A man makes regular equal monthly payments into a savings account that earns interest at a rate of 12, 7% pa. If the amount in the account immediately after he made his 17th payment was equal to R4 250, then determine the amount in the account (rounded to the nearest cent) immediately after he makes his 46th payment. 6. An amount of money was invested at an interest rate of 8,9% pa compounded quarterly. Two and a half years later the interest rate changed to 10,3% pa compounded monthly and the money was reinvested at that time for a further eighteen months. Calculate the overall equivalent effective annual interest rate (rounded to two decimal places) for the entire investment period. 7. How much money (rounded to the nearest rand) must be deposited into an account now at 6% pa compounded every six months such that regular equal amounts of R20 000 may be withdrawn from the account every six months in perpetuity starting one year from now