You have just received a windfall from an investment you made in a​ friend's business. She will be paying you $ 36 comma 079 at the end of this​ year, $ 72 comma 158 at the end of next​ year, and $ 108 comma 237 at the end of the year after that​ (three years from​ today). The interest rate is 5.6 % 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)?