Ram's salary is 25% more than Raja's. How much percent is Raja's salary less than Ram's?  Answers:
A) 10 % B) 15 % C) 20 % D) 25 % E) 50 %

Rationale: raja ' s salary less than ram ' s by 25 / ( 100 + 25 ) * 100 % = 20 % answer is c
Answer: C