http://www.eons.com/money/feature/644?section=growthenestegg
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If you know either the interest rate or the time period desired to achieve a financial goal, the Rule of 72 will help to estimate the unknown element. For example, if the interest rate is known, say 9 percent, the time period to double our investment is estimated by dividing 72 by the rate (72/9). It would take about 8 years to double our investment at 9 percent.
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I use 4% for the rate of return assumption, and 6% for the rate of inflation (that hidden tax increase). So that means that every dollar I’m holding is worht 2% next year UNLESS I do something with it. Arghhhh!
Reinke Faces Life 