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If you invest just once, then there comes a time in which the amount of your investment will be doubled. For example, if you invested $ 1,000 in deposits that provide interest rate of 12% per year (on roll over each year), then your money will be doubled within six years.

How to calculate is to use the Law of 72. This means that: 72 : 12% = 6 years.

That's the time period for your investment can be doubled.

Obviously, the higher your investment, the faster your investment also doubled. For example, if your deposit rate was 24% per year (on roll over each year), then your $ 1,000 will be doubled in 3 years (72: 24 = 3). Compare the interest rate if your deposit only 12%.