Question

A sum of money becomes 5/8 of itself in 5 years at a certain rate of simple interest.Find the rate of interest.

Answer 1

let the sum of money be'x'.then
and t=5years(given)
hence SI=xr×5/100
SI=xr/20
by question
5x/8=xr/20
5/8=r/20
100=8r
r=12.5%

Answer 2

$\huge{\underline{\underline{\mathfrak{\pink{Answer:}}}}}$

Refer to the attachment!