# Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time ?

Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time ?

A. 4 years

B. 6 years

C. 2 years

D. 3 years

**Answer : **D. 3 years...

## Explanation :

Amount = 9261 p = 8000

rate = 5%

A = p [ 1 + r / 100]^{n}

9261 = 8000[1 + 5/100]^{n}

=> 9261 / 8000 = [21 / 20]^{n}

=> [21 / 20]^{3}=[21 / 20]^{n}

on comparing n = 3 so it will take 3years