I bought two books; for Rs. 480. I sold one at a gain of 10% and other at a gain of 20% and then I found each book was sold at the same price. Find the cost of the book sold at a lesser gain ?  Choose the correct option:  A) A)657  B) B)280  C) C)438  D) D)250  E) E)427
x*(110/100)   = (480 - x)120/100   x = 250.4   Answer: 250
<result>D</result>
I bought two books; for Rs. 480. I sold one at a gain of 10% and other at a gain of 20% and then I found each book was sold at the same price. Find the cost of the book sold at a lesser gain ?