Task: Question Answering
Input (English): Problem: an association of mathematics teachers has 1,260 members . only 640 of these members cast votes in the election for president of the association . what percent of the total membership voted for the winning candidate if the winning candidate received 60 percent of the votes cast ? 
Options: a ) 30.47 % , b ) 58 % , c ) 42 % , d ) 34 % , e ) 25 %
Output (English): a