The human population of Madagascar doubles about every how many years?

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Multiple Choice

The human population of Madagascar doubles about every how many years?

Explanation:
Doubling time is determined by how fast the population grows each year. A handy way to estimate it is the Rule of 70: doubling time in years ≈ 70 divided by the annual growth rate (as a percent). For Madagascar, the growth rate is about 2.8–3% per year. Using 70 / 2.8 gives roughly 25 years (70 / 3 yields about 23 years). Since these are estimates, saying the population doubles about every 25 years is a reasonable approximation.

Doubling time is determined by how fast the population grows each year. A handy way to estimate it is the Rule of 70: doubling time in years ≈ 70 divided by the annual growth rate (as a percent). For Madagascar, the growth rate is about 2.8–3% per year. Using 70 / 2.8 gives roughly 25 years (70 / 3 yields about 23 years). Since these are estimates, saying the population doubles about every 25 years is a reasonable approximation.

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