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Rule of 115? How does it come about?

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How does the rule of 115 relate to the rule of 72 ? I don’t understand how it came about. I really need help. Its for my final maths assignment of year 12 !

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    Pinyo on Jun 02, 2010

    Rule of 115 is an extension of Rule 72. Rule 72 is a trick that helps you figure out how long (or at what rate or return) you need to double your money. Rule of 115 helps you figure out how long, or the rate you need, to triple your money.


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