Task: Question Answering
Input (English): Problem: i bought two books ; for rs . 420 . 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 loss ? 
Options: a ) 197 , b ) 245 , c ) 189 , d ) 278 , e ) 268
Output (English): b