You have just received a windfall from an investment you made in a friend's business. she will be paying you $ 15 comma 555 at the end of this year, $ 31 comma 110 at the end of next year, and $ 46 comma 665 at the end of the year after that (three years from today). the interest rate is 6.7 % per year. a. what is the present value of your windfall? b. what is the future value of your windfall in three years (on the date of the last payment)?