Question

A what rate percent,the simple interest on a sum of money treble it self in 25 years

Answer 1

Let principal sum be rs 100
P =100
R=?
T=25 yrs
Amount = 3×100=300 rs
S.I.=A-P=300-100=200 RS
By formulae,
R=100×S.I./P×T=100×200/100×25
= 8%p.a.