Question

In how many years will rs. 4000 amount to rs. 5324 at 10% C. I.

Answer 1

CI=p {(1+r)^n-1}

5324-4000=4000 {(1+10/100)^n}-4000

5324=4000 (1+1/10)^n

5324/4000=(11/10)^n

1331/1000=(11/10)^n

(11/10)^3=(11/10)^n

n=3 

hence 3 years

Answer 2

Principal=₹4000
Amount =₹5324
Rate =10%
Let the time be t years
According to the ques ,
Amount =p(1+r/100)^t
5324=4000(1+10/100)^t
5324/4000=(1+1/10)^t
(1331/1000)=(11/10)^t
(11/10)^3=(11/10)^t
t=3
Therefore , the answer is three years .
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