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A comment on Ask HN: Do you know any useful "Back of the Envelope Calculations"?.

Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by keyle on Friday September 17, 2010 @11:53PM (#1703660)
The rule of 72 for me is a classic that comes to my mind.

http://en.wikipedia.org/wiki/Rule_of_72

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