Question

In how much time would the simple interest on a certain sum be 0.75 times the principal at the rate 20% per annum

Answer 1

Here we are given that the Interest is 0.75 times the principal.

I=0.75P

Now we are also given rate of interest as 20% per annum.

The formula for simple interest is given as :

$I=\frac{PRT}{100}$

Where,

P=Principal

I=Interest

R=rate of interest

T=time

So plugging the values of I and R here

$0.75P=\frac{P(20)T}{100}$

P will get cancelled on both sides,

T= 0.75/0.20 = 3.75

T= 3.75 years.

Answer: In 3.75 years, simple interest on a certain sum be 0.75 times the principal at the rate 20% per annum.