A sum of money deposited at C.I. amounts to Rs.2420 in 2 years and to Rs.2662 in 3 years. Find the rate percent? Choose the correct choice from the following answers:  A) 23 %  B) 10 %  C) 32 %  D) 98 %  E) 31 %

Rationale: "2420 - - - 242 100 - - - ? = > 10 % answer : b"
Answer: B