You have just received a windfall from an investment you made in a? friend's business. She will be paying you $ 16 comma 145$16,145 at the end of this? year, $ 32 comma 290$32,290 at the end of next? year, and $ 48 comma 435$48,435 at the end of the year after that? (three years from? today). The interest rate is 7.5 %7.5% 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)?