A sum of money deposited at C.I. amounts to Rs.3000 in 3 years and to Rs.3600 in 4 years. Find the rate percent? Select: A) 25 % B) 5 % C) 10 % D) 15 % E) 20 %

Rationale: "3000 - - - 600 100 - - - ? = > 20 % answer : e"
Answer: E