<PRE><B>Question 404056</B>
The growth rate of the world is 2.67% per year.If the present population of earth is 8 billion people, how long before the population doubles?
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A(t) = ab^x
16 = 8(1+0.0267)^x
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1.0267^x = 2
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x(log(1.0267)) = log(2)
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x = log(2)/log(1.0267)
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x = 26.31 years
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Cheers,
Stan H.</PRE>