A trader bought a car at 20% discount on its original price. He sold it at a 45% increase on the price he bought it. What percent of profit did he make on the original price?
Pick one:
A) 10 % B) 12 % C) 16 % D) 20 % E) 22 %

Rationale: "original price = 100 cp = 80 s = 80 * ( 145 / 100 ) = 116 100 - 116 = 16 % c )"
Answer: C