Task: Question Answering
Input (English): Problem: a trader bought a car at 20 % discount on its original price . he sold it at a 50 % increase on the price he bought it . what percent of profit did he make on the original price ? 
Options: a ) 17 % , b ) 72 % , c ) 20 % , d ) 82 % , e ) 16 %
Output (English): c