11. How long does it take for money to double at 9.5% compounded monthly?

12. What is the annual compounded rate if $550 accumulates $775 in 3 years?

13. In how many years will money triple at 11% compounded semi-annually?

14. Find the present value of $13000 due in three years and 7 months if money is worth 12% p.a. compounded monthly.

15. How long does it take for money to double at 9.5% compounded monthly?