What is the future value of each of the following streams of payments? a.) $500 a year for 10 years compounded annually at 6% b.) $150 a year for 5 years compounded annually at 14% 6. what is the present value of the following annuities? a.) $3,000 a year for 10 years discounted back to the present at 8% b. $50 a year for 3 years discounted back to the present at 3%