Question

A sum of money becomes 4 times in 12 years at
simple interest. Find the rate of interest:​

Answer 1

Answer:

I = 3p

N=12

R = 100 xl/PN=100x3P/Px12

= 25%

Answer 2

Answer:

25%

Step-by-step explanation:

Let Certain Sum be Rs 100

Given that,

Time = 10 years

and

Amount Would 4 times

Hence,

Amount = 100×4 = Rs 400

Simple Interest = Amount - Principal

S.I = Rs 400 - Rs 100

$\underline{\boxed{S.I =\:Rs\:300}}$

Now,

$\sf \: Rate = \dfrac{S.I \times 100}{P \times \: T }$

$\sf \: Rate = \cancel \dfrac{300 \times 100} { 100 \times 12}$

$\sf \: Rate = \dfrac{300}{12}$

$\underline{\boxed{Rate\:=25\: \%}}$