Task: Question Answering
Input (English): Problem: i bought two books ; for rs . 500 . 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 ) 337 , b ) 280 , c ) 299.67 , d ) 266.67 , e ) 291.67
Output (English): e