Question

if the simple interest on a sum equals to 1 by 10 of itself in 4 years find the rate percent

Answer 1

SI=prt/100
=pr×4/100
=pr/25
by question
pr/25=1/10×p
=pr/25=p/10
=r/25=1/10
=by cross multiplication
10r=25
r=2.5%