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?

A. 10%
B. 11%
C. 12%
D. 15%

Explanation:

Original price = 100

CP = 80

S = 80*(140/100) = 112

100 – 112 = 12%