Question

If the interest of the sum of money for certain year is 1/3of the amount at the rate of 20% per annum find the period time.​

Answer 1

Answer:

Let the principal =Rs.x, Amount =Rs.3x, Time =20 years

∴S.I.=Rs.3x−Rs.x=Rs.2x

Rate =(

x×20

2x×100

)%p.a.=10%p.a.

Now, Principal =Rs.x, Amount =Rs.2x, Rate =10%p.a.

S.I.=Rs.2x−Rs.x=Rs.x

∴ Time =

x×10

x×100

=10 years.