Rule of 72

Just learned another trick of compounding. Rule of 72 is a way to know how fast your money will double. Estimate the yearly rate of return and divide it into the number 72. The result is the number of years it will take for the investment to roughly double in value.

For example, US$10,000.00 investment. If the Annual Return is 3%, it will take 24 years to get the double as US$20,000.00.

3% - 24 Years
6% - 12 Years
9% - 8 Years
12% - 6 Years

Anyway, it is just math... Let's say if it happens in your salary rate...