# 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 to have your money double in 10 years?

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#### Solution Preview

The Equation to use is F=P(1+i)^t where P is the present worth of you investment, F is the Future worth, i is interest rate(decimal) and t is the years of the investment.

a) How many years does it take $1 to double if invested at 10% ?

In this case interest ...

#### Solution Summary

Compound Interest, Future Value and Present Value are exemplified.

$2.19