That is something that is never taught to kids at all. If there is one subject they ought to be taught at school, it should be this. Maybe next time @rocketbee?? Surely there's time to do it over again? :)
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Two of my kids actually had a little bit of this in school, but nothing so practical as the Rule of 72. Sadly most people have the power of compounding working against them and they don't even know it.