Question

A sum of money at simple interest doubles itself in 10 years. Find the rate per cent per annum.​

Answer 1

$\huge\red{\underline{{\boxed{\textbf{ANSWER}}}}}$

Let the principal be =x

Then,in 2 years the amount will be- x×2=2x

Now,

interest= amount - principal

=2x - x = 1x

Time= 10 year

Rate=?

Now,

RATE= interest/principal×100/time

So, R=1X/X × 100/10

R=10%