Task: Question Answering
Input (English): Question: 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 ?

 Option A: A

 Option B: B

 Option C: C

 Option D: D

 Option E: E
Output (English): Option D