12 points) An equal annual series of payments of P 500 is made beginning at the end of year 4 and ending at the end of year 10. The interest rate is 10% compounded annually. a. What single payment at the end of year 7 is equivalent to the given annual payments of P 500? b. What is the present worth of all the annual payments? c. What is the future worth of all the annual payments? d. Draw the cash flow diagram.