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According to this formula, about how long will it take a population to double if the annunal growth rate is 3.2%? Note:

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1 Answer

Hi Kristany,
 
Using the formula, we would have
 
   T = 70 / 3.2, or 21.875 years
 
I'd say the approximate value is 22 years, rounding to the nearest whole year.
 
For the math behind the "rule of 70", please see
 
 
Note that instead of the "rule of 70" some people use the "rule of 72", for example
 
 
Either way, we get the same approximate value of 22 years (when rounded to the nearest whole year).
 
Best wishes.