A sum of money deposited at compound interest (compounded yearly) amounts to $6200 in 2 years and to $6324 in 3 years. What is the interest rate? Pick.
A) 2% B) 3% C) 4% D) 5% E) 6%
6324 - 6200= 
<gadget id="calculator">6324 - 6200</gadget>
<output>124</output>
124   124 / 6200= 
<gadget id="calculator">124 / 6200</gadget>
<output>1/50 = around 0.02</output>
0.02= 2%   The answer is 2%.
<result>A</result>
A sum of money deposited at compound interest (compounded yearly) amounts to $6200 in 2 years and to $6324 in 3 years. What is the interest rate?