Money Matters--Chapter 8 - Rule of 72
Take 72 and divide by either the number of years (to get interest rate needed) or divide by the interest rate (to get the number of years needed)
For example: What annual interest rate will cause your money to double in 8 years?
72/8 = 9%
How long will it take for an investment to double at 4% interest?
72/4 = 18 years
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