Question

if sum of money doubles in 4 years find its rate of simple interest​

Answer 1

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ \boxed{\boxed { \huge \mathcal\red{ solution}}}}$

$\huge \star$ Given:

principal=p (let)

rate of interest=?

Now according to the Question

sum of money doubles in 4 years

$\therefore$interest=(2p-p)=p Rs

and time=4 years

$\huge \star$ FOR Simple Interest

$\bf \red{\boxed{interest = \frac{principal \times \: interest \: rate \times time}{100} }}$

Now putting the values....

$\implies\bf {\cancel p = \frac{\cancel p \times \:r \times \cancel4}{\cancel{100}} }\\ \implies\boxed{\bf r=25\%}$

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