Find the present value of the given future payment at the specified interest rate.
1. $6000 due in 20 years at 5% compounded annually
2. $3500 due in eight years at 6% effective
3. $4000 due in 12 years at 7% compounded semiannually
4. $1950 due in three years at 16% compounded monthly
5. $9000 due in 5 1/2 years at 8% compounded quarterly
6. $6000 due in 6 1/2 years at 10% compounded semiannually
7. $8000 due in five years at 10% compounded monthly
8. $500 due in three years at 8 3/4% compounded quarterly
9. $5000 due in two years at 7 1/2% compounded daily
10. $1250 due in 1 1/2 years at 13 1/2% compounded weekly 4