A shop owner sells 25mtr of cloth and gains SP of 10 mtrs. Find the gain %?  Choose the correct option:
A) 30%
B) 40%
C) 50%
D) 66.67%
E) 70%
Here, selling price of 10 m cloth is obtained as profit.   Profit of 10 m cloth = (S.P. of 25 m cloth) – (C.P. of 25 m cloth)   Selling price of 15 m cloth = Selling Price of 25 m of cloth   Let cost of each metre be Rs. 100.   Therefore, cost price of 15 m cloth = Rs. 1500 and S.P. of 15 m cloth = Rs. Rs. 2500   Profit% = 10/15 × 100 =66.67%   Profit of 66.67% was made by the merchant.   66.67%
<result>D</result>
A shop owner sells 25mtr of cloth and gains SP of 10 mtrs. Find the gain %?