Task: Question Answering
Input (English): Problem: if the price of an article went up by 15 % , then by what percent should it be brought down to bring it back to its original price ? 
Options: a ) 17.39 % , b ) 2 / 8 % , c ) 2 / 1 % , d ) 1 / 3 % , e ) 2 / 7 %
Output (English): a