The annual interest rate earned by an investment increased by 10 percent from last year to this year. If the annual interest rate earned by the investment this year was 9 percent, what was the annual interest rate last year?	Select the correct option:  A) 1%  B) 1.1%  C) 8.18%  D) 10%  E) 10.8%
9=1.1*x   X=8.18%   Answer 8.18%)
<result>C</result>
The annual interest rate earned by an investment increased by 10 percent from last year to this year. If the annual interest rate earned by the investment this year was 9 percent, what was the annual interest rate last year?