### Compound Interest, Future Value and Present Value.

Interest rate is critical to the speed at which your investment grows. If $1 is invested at 2%, it takes approximately 34.9 years to double. If $1 is invested at 5%, it takes approximately 14.2 years to double. How many years does it take $1 to double if invested at 10% and 12%? At what interest rate would you need to invest