A merchant marks his goods up by 20% and then offers a discount of 10% on the marked price. What % profit does the merchant make after the discount?	Choose the correct choice from the following answers:
A) 8 %
B) 10 %
C) 21 %
D) 15 %
E) 17 %

Rationale: "let the price be 100 . the price becomes 120 after a 20 % markup . now a discount of 10 % on 120 . profit = 108 - 100 8 % answer a"
Answer: A