Question

A sum ammount php 2400 at 15% simple interest per annum after four years. Find the sum

Answer 1

let the sum be x
si=x*15*4/100
si=3x/5x
amount=p+si
2400=x+3/5x
x=1500. ans.

Answer 2

let sum (P) be x
R=15%p.a.
T=4 years
SI=PRT/100
=x*15*4/100
=3x/5
amount =p+si
2400=x+3x/5
=2400×5=x+3x
=12000=4x
=x=12000÷4=3000