At the end of three years what will be the compound interest at the rate of 10% p.a. on an amount of Rs.20000?

At the end of three years what will be the compound interest at the rate of 10% p.a. on an amount of Rs.20000?

A. Rs.6620
B. Rs.6500
C. Rs.6800
D. Rs.6400
Explanation:
A = 20000(11/10)3
= 26620
= 20000
———-
6620