SOLUTION: how long will it take for the population of a certain country to quadruple if its annual growth rate is 2.5% round to the nearest year.

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Question 767705: how long will it take for the population of a certain country to quadruple if its annual growth rate is 2.5% round to the nearest year.
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
Growth model:
%0D%0A4P%5B0%5D+=P%5B0%5D%281%2B0.025%29%5Et%0D%0A
which we simplify to get

%0D%0A4+=%281%2B0.025%29%5Et%0D%0A
solving for t ...
ln%284%29=t%2Aln%281.025%29%0D%0A


ln%284%29%2Fln%281.025%29=t%0D%0A
this is about 81 years