Natural increase and doubling time

Change the birth and death rates to see the natural increase and the doubling time.

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Questions students ask

What is the rule of 70?

Divide 70 by the percentage growth rate to estimate the doubling time: 2% growth doubles a population in about 35 years.

What formula does it use?

Natural increase (%) = (birth rate − death rate) ÷ 10; doubling time ≈ 70 ÷ growth %.

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