You have just received a windfall from an investment made in a friend's business. He will be paying you $10,000 at the end of this year, $20,000 at the end of the following year, and $30,000 at the end of the year after that (three years from today). The interest rate is 3.5% per year. What is the future value of your windfall in three years (on the date of the last payment)?