Question

A certain sum is invested for certain time. It amounts to rs 3500 at 10% per annum. But when invested at 8% per annum, it amounts to rs 3000

Answer 1

Answer.

Let the sum be p

si1=a1-p

=35-p

t=(35-p)×100/10×p

=350-10p/p

t=(30-p)×100/8×p

=375-12.5p/p

as both t are equal

375-12.5p/p=350-10p/p

= 375-12.5p=350-10p

=375-350=(12.5-10)p

=25=2.5p

=p=25/2.5

=10

t=20×100/8×10

=25years

Hope this will help you