Question

in how many years will a certain sum of money double itself at the rate of 10% p.a

Answer 1

Principle = X

Amount = 2X

Rate of Interest = 10%

Interest = Amount - Principle

=2x-x

=x

Interest=p×r×t/100

x=x×10×n/100

x×100/x×10=n

n=10

In 10 years a certain sum of money(X) will double itself to (2X) at the rate of 10% per annum.