If an article is sold at 18% profit instead of 9% profit, then the profit would be $54 more. What is the cost price? Choose the correct choice from the following answers:
A) $ 500
B) $ 600
C) $ 700
D) $ 800
E) $ 900

Rationale: 9 % * cost price = $ 54 1 % * cost price = $ 54 / 9 = $ 6 the cost price is $ 600 . the answer is b .
Answer: B