Thank you so much, but the fact is even if a person completes a first cycle of say as in my case it was 5 years to double the money. I deposited a fixed amount every month for 5 years and then renewed it every month on maturity for 25, my amount became 16 times which is still giving me enough interest. So I only had to deposit for five years but in my case I increased the basic amount on every maturity.