A merchant marks his goods up by 50% and then offers a discount of 20% on the marked price. What % profit does the merchant make after the discount?	Select the correct option:
A) 20 % B) 25 % C) 69 % D) 31 % E) 19 %

Rationale: "let the price be 100 . the price becomes 150 after a 50 % markup . now a discount of 20 % on 150 . profit = 120 - 100 20 % answer a"
Answer: A