Question

# Starting from a $2013$ population of $7.1$ billion, use the given growth rate to find the approximate doubling time (use the rule of $70$) and to predict world population in $2050$.Use the average annual growth rate between $1950$ and $2000$, which was about $1.8 \%$.

Solution

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Using the approximate doubling time formula

$T_{\text{~double}}=\dfrac{70}{P}$

we obtain

$T_{\text{~double}}=\dfrac{70}{1.8}=39\text{~years}$