A merchant sells 30 metres of cloth and gains selling price of 10 metres. Find the gain percent.  Choose the correct choice from the following answers
A) 15 % B) 25 % C) 50 % D) 75% E) 70 %
Here, selling price of 10 m cloth is obtained as profit.   Profit of 10 m cloth = (S.P. of 30 m cloth) – (C.P. of 30 m cloth)   Selling price of 20 m cloth = Selling Price of 30 m of cloth   Let cost of each metre be Rs. 100.   Therefore, cost price of 20 m cloth = Rs. 2000 and S.P. of 20 m cloth = Rs. Rs. 3000   Profit% =	10/20*100= 
<gadget id="calculator">10/20*100</gadget>
<output>50</output>
50%   Profit of 50 % was made by the merchant.   ANSWER IS 50 %
<result>C</result>
A merchant sells 30 metres of cloth and gains selling price of 10 metres. Find the gain percent.