A sum of money deposited at C.I. amounts to Rs.2420 in 2 years and to Rs.2783 in 3 years. Find the rate percent? Answers:
A) 15
B) 10
C) 28
D) 24
E) 82

Rationale: "explanation : 2420 - - - 363 100 - - - ? = > 15 % answer : option a"
Answer: A