Task: Question Answering
Input (English): Problem: in what time a sum of money double itself at 4 % per annum simple interest ? 
Options: a ) 25 % , b ) 33 1 / 3 % , c ) 83 1 / 3 % , d ) 33 4 / 3 % , e ) 73 1 / 3 %
Output (English): a