Question

the sum that will become Rs 810 in 7 years at 5%p.a​

Answer 1

Amount -810
time-7yrs
rate-5% p.a
Interest =?
principal=?
Interest=Amount -principal
=810-p
interest=810-p
principal=interest *100/rate*time
principal=(810-p)*100/5*7
35p=81000-100p
35p+100p=81000
135p=81000
p=81000/135
principal=600

Answer -principal is 600