Two numbers are 30% and 37% are less than a third number .How much percent is the second number less than the first? Pick one.
A) 19 % B) 80 % C) 10 % D) 90 % E) 15 %

Rationale: i ii iii 70 63 100 70 - - - - - - - - 7 100 - - - - - - ? = > 10 % answer : c
Answer: C