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At what rate percent per annum will Rs 4500 amount to Rs 5715 in 3 years ?
Given :
Principal $P = Rs. 4500$
Amount $A = Rs. 5715$
Time $T = 3$ years
To do :
We have to find the rate of interest.
Solution :
Let the rate percent be R.
We know that,
$Amount (A) = Principal (P) + Simple Interest (SI)$
$Simple Interest (SI) = Amount (A) - Principal (P)$
$= Rs. (5715 - 4500)$
$= Rs. 1215$
$SI = \frac{PRT}{100}$
Therefore,
$Rs. 1215 = \frac{(4500 \times R \times 3)}{100}$
$Rs. 1215 = 45 \times R \times 3$
$R = \frac{1215}{(45\times3)}$
$R = 9$
The rate percent is 9%.
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