A trader bought a car at 30% 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) 7 %  B) 62 %  C) 12 %  D) 19 %  E) 5 %

Rationale: "original price = 100 cp = 70 s = 70 * ( 150 / 100 ) = 105 100 - 105 = 5 % answer : e"
Answer: E