A trader bought a car at 20% discount on its original price. He sold it at a 40% increase on the price he bought it. What percent of profit did he make on the original price?  Choose the correct choice from the following answers.
A) 82 %
B) 52 %
C) 12 %
D) 19 %
E) 22 %

Rationale: "original price = 100 cp = 80 s = 80 * ( 140 / 100 ) = 112 100 - 112 = 12 % answer : c"
Answer: C