Population increases by 3.6% every year.
The population in question doubles every 20 years and you need to find out the annual rate of increase.
You can use the rule of 72 which allows you to calculate the doubling time of a variable by the formula:
Time to double = 72 / Rate
As we already have the time the double, the rate is:
20 = 72 / Rate
Rate x 20 = 72
Rate = 72/20
Rate = 3.6%
The population therefore increases by 3.6% every year.
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