$500 will become $1000 in 4 years find the rate of interest? Choices.
A) A)10%  B) B)20%  C) C)25%  D) D)30%  E) E)50%
SI = simple interest = A-P = 1000-500= 
<gadget id="calculator">1000-500</gadget>
<output>500</output>
$500   R= 100SI/PT = 100*500/500*4 =25%   Answer is 25%
<result>C</result>
$500 will become $1000 in 4 years find the rate of interest?