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Rule of 72


	The Rule of 72 approximates the time for an investment to double by dividing 72 by the interest rate. For example, it takes about 72/9 = 8 years if the annual interest rate is 9%. Compare the actual doubling time with the estimate provided by the Rule of 72.


	Contributed by: Nilay Gandhi

Rule of 72 (Wolfram MathWorld)

"Rule of 72" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/RuleOf72/

Contributed by: Nilay Gandhi

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