A simple way to know the time it takes for money to double is to use the rule of 72. For example, if you wanted to know how many years it would take for an investment earning 12% to double, simply divide 72 by 12, and the answer would be approximately six years. The reverse is also true. If you wanted to know what interest rate you would have to earn to double your money in five years, then divide 72 by five, and the answer is about 15%.
Using the rule of 72, if you invested $10,000 at 12% per year, in 12 years, you would have:
$20,000 after the first six years, and $40,000 after 12 years.
Using the rule of 72, if you invested $10,000 at 12% per year, in 12 years, you would have:
$20,000 after the first six years, and $40,000 after 12 years.
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