Question

You deposit a certain amount in a bank at 9% rate of interest compounded
annually. In how many years your money will be doubled?

Answer 1

Rate(R)=9%

principal (p)=X(let)

Amount (A)=2x (from question)

Time (T)=?

Now,

compound Amount (CA)= p(1+(R/100)^T)

2x=X(1+(9/100)^T)

2=1+(9/100)^T

1=(0.09)^T

T=11.11years