A man buy a book in Rs50 & sale it Rs100. What is the rate of profit ???  Choose the correct choice:
A) 10%  B) 100%  C) 30%  D) 25%  E) 28%
cp=50   sp=100   profit=100-50= 
<gadget id="calculator">100-50</gadget>
<output>50</output>
50   %=50/50*100= 
<gadget id="calculator">50/50*100</gadget>
<output>100</output>
100%   ANSWER:100%
<result>B</result>
A man buy a book in Rs50 & sale it Rs100. What is the rate of profit ???