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56 Don’t Make Me Say I Told You So
rate, and the result is the approximate number of years needed
to double the investment.
The Rule of 72
Rate of return 2% 4% 6% 8% 10%
Time to double 36 years 18 years 12 years 9 years 7.2 years
The “Rule of 115” is a mathematical formula that makes it
possible to estimate how long it will take investments to triple
in value. Divide 115 by an interest rate, and the result is the
approximate number of years needed to triple the investment.
The Rule of 115
Rate of return 2% 4% 6% 8% 10%
Time to triple 57.5 years 29 years 19 years 14 years 11.5 years
These results are hypothetical and are not intended to predict or project the performance
of any specific investment.
Chapter 3: You Must Have Growth In Your Portfolio
