# How long will a $9000 investment take to earn $180 interest at an annual interest rate of 8%?

##### 1 Answer

May 11, 2018

#### Explanation:

*Simple Interest*

Plug your data into your equation.

First, multiply 9000 by .08 to simplify in order to isolate for t.

Divide 180 by 720 to isolate for t.

Source and for more info:

https://www.thoughtco.com/calculate-simple-interest-principal-rate-over-time-2312105