The sum of money will be double itself in 20years and simple interest find rate of interest? Choose the most appropriate option
A) 10%  B) 5%  C) 15%  D) 20%  E) 25%
T = 20 years   P= principle amount = x   A = total amount = 2x   SI = simple interest = A-P = 2x-x = x   R = 100SI/PT = 100x/20x =5%   Answer is 5%100 /20= 
<gadget id="calculator">100 /20</gadget>
<output>5</output>
5%   Answer is 5%
<result>B</result>
The sum of money will be double itself in 20years and simple interest find rate of interest?