Task: Question Answering
Input (English): Problem: i bought two books ; for rs . 480 . i sold one at a loss of 15 % and other at a gain of 19 % and then i found each book was sold at the same price . find the cost of the book sold at a gain ? 
Options: a ) a ) 657 , b ) b ) 200 , c ) c ) 438 , d ) d ) 290 , e ) e ) 427
Output (English): b