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