A sum of money deposited at C.I. amounts to Rs.500 in 3 years and to Rs.650 in 4 years. Find the rate percent?	Choose the correct choice from the following answers: A) 25 % B) 30 % C) 35 % D) 40 % E) 45 %

Rationale: "500 - - - 150 100 - - - ? = > 30 % answer : b"
Answer: B