If the selling price of 5 books is same as the cost price of 10 books. Find the gain or loss percentage? Choose the correct choice from the following
A) 50% B) 100% C) 45% D) 55% E) 65%
Let the C.P of each book be Re 1. Then,   S.P of 5 books= C.P of 10 books= Rs. 10   Now, C.P of 5 books= Rs.5, S.p of 5 books= Rs 10   Gain = Rs ( 10 -5 )= 
<gadget id="calculator">( 10 -5 )</gadget>
<output>5</output>
Rs 5.   Gain%= ( 5/5× 100 ) % = 100%   Answer : 100%
<result>B</result>
If the selling price of 5 books is same as the cost price of 10 books. Find the gain or loss percentage?