A sum of money deposited at compound interest (compounded yearly) amounts to $1210 in 2 years and to $1452 in 3 years. What is the interest rate?	Choices.
A) 20% B) 10% C) 60% D) 70% E) 30%
1452 - 1210= 
<gadget id="calculator">1452 - 1210</gadget>
<output>242</output>
242   242 / 1210= 
<gadget id="calculator">242 / 1210</gadget>
<output>1/5 = around 0.2</output>
0.2= 20%   The answer is 20%.
<result>A</result>
A sum of money deposited at compound interest (compounded yearly) amounts to $1210 in 2 years and to $1452 in 3 years. What is the interest rate?