Answer:
9%
Step-by-step explanation:
You are going to want to use a modified compound interest formula, as shown below. This version of the compound interest formula is what you use to solve for the interest rate.
<em>r = interest rate (decimal)</em>
<em>n = numbers of times compounded (annually)</em>
<em>A = total amount</em>
<em>P = principal amount</em>
<em>t = time (years)</em>
Now, lets plug in the values:
r = 9% interest rate