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


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