The amount of principal Rs.8000 at compound interest at the ratio of 5% p.a. for 4 years is
Choose the correct choice from the following answers:
A) s . 9621
B) s . 6921
C) s . 9724
D) s . 6261
E) s . 6361

Rationale: "c . i = p ( 1 + r / 100 ) ^ n = 8000 ( 1 + 5 / 100 ) ^ 4 = rs 9724 answer : c"
Answer: C