What is the present worth of the future payments listed below:
a. $5500, 6 years from now, at an interest rate of 10% compounded annually
b. $8500, 15 years from now, at an interest rate of 6% compounded annually
c. $30,000, 5 years from now, at an interest rate of 8% compounded annually
d. $15,000, 8 years from now, at an interest rate of 12% compounded annually