If 12% of x is equal to 6% of y, then 18% of x will be equal to how much % of y ?  Choose the correct choice from the following answers:  A) 7 %  B) 9 %  C) 11 %  D) 12 %  E) none of these

Rationale: we have , 12 % of x = 6 % of y = > 2 % of x = 1 % of y = > ( 2 x 9 ) % of x = ( 1 x 9 ) % of y thus , 18 % of x = 9 % of y . answer : b
Answer: B