Question

At what rate percent per annum simple interest will a sum be double of itself in 8 yeara

Answer 1

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Here is your answer.
Let R = r%
P = Rs p
A = 2p
T = 8 years

S.I = Rs. P

As we know the formula,

$r = \frac{100 \times si}{p \times t} \\ \\ r = \frac{100 \times p}{p \times 8} \\ \\ r = \frac{100}{8} \\ r = 12.5\%$
Therefore, The rate of interest is 12.5%.

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Answer 2

Hi friends

Here is your answer

If Sum is doubled then

Rate of interest = 100/Time
$= \frac{100}{8} \\ \\ = 12.5\%$
So Rate of interest is 12.5%

Hope it helps you

@ MSD