Question

At simple interest of a sum becomes eight - fifth of itself in 5 years the rate of simple interest is=​

Answer 1

Answer:

hope it helps you

Step-by-step explanation:

I am happy to helped you

Answer 2

Answer:

the rate of interest is 12%

Step-by-step explanation:

Given, Simple interest  , Amount is $\frac{8}{5}$th of its principal in 5 years

Let the principal , p  be  x

given time, n = 5 yrs.

Now ,

Amount, A = $\frac{8}{5}$*x = $\frac{8x}{5}$

We know that

I = A - p

I = ( $\frac{8x}{5}$ - x )  =  $\frac{8x-5x}{5}$  =  $\frac{3x}{5}$

also,  I = $\frac{pnr}{100}$

=> $\frac{3x}{5}$ = $\frac{x*5*r}{100}$

=> 3x*100 = 5rx*5

=> 300x = 25rx

=> 25r = 300

=> r = 300/25 = 12

ie., the rate of interest is 12%