Task: Question Answering
Input (English): Problem: a trader bought a car at 20 % discount on its original price . he sold it at a 100 % increase on the price he bought it . what percent of profit did he make on the original price ? 
Options: a ) 18 % , b ) 13 % , c ) 60 % , d ) 40 % , e ) 15 %
Output (English): c