In how many years will Tk. 2000 amounts to Tk. 2420 at 10% per annum compound interest?

Question: In how many years will Tk. 2000 amounts to Tk. 2420 at 10% per annum compound interest?

Solution:
Principal = Tk. 2000
Amount = Tk. 2420
Rate = 10%

We Know
C = P(1 + r)ⁿ
2420 = 2000(1 + 10/100)ⁿ
2420/2000 = (11/10)ⁿ
121/100 = (11/10)ⁿ
(11/10)² = (11/10)ⁿ
n = 2