Question

The rate at which a sum becomes
four times of itself in 15 years at
simple interest will be:
​

Answer 1

Let, the Principal be Rs. x and rate of interest be r%

Then, Amount will be 4x

S. I. = 4x - x = 3x

Now, according to the question

$3x = \frac{x \times 15 \times r}{100} \\ \\ = > r = \frac{300}{15} = 20$

So, the rate of interest will be 20% ✔✔

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Hope it helps ☺

Fóllòw Më ❤