The annual interest rate earned by an investment increased by 11 percent from last year to this year. If the annual interest rate earned by the investment this year was 22 percent, what was the annual interest rate last year?  Choose the correct choice:
A) 17%
B) 19%
C) 18%
D) 20%
E) 22%
let i = interest rate   i(this year) = i(last year) + 0.11i(last year) = 1.11i(last year)   22 = 1.11 x i(last year)   i(last year) = 22/1.1 = 220/11= 
<gadget id="calculator">220/11</gadget>
<output>20</output>
20%   Answer : 20%
<result>D</result>
The annual interest rate earned by an investment increased by 11 percent from last year to this year. If the annual interest rate earned by the investment this year was 22 percent, what was the annual interest rate last year?