Multiple choice

The annual birth and death rates per 1000 are 39.4 and 19.4, respectively. The number of years in which the population will be doubled assuming there is no immigration or emigration is:

  1. 35 years

  2. 30 years

  3. 25 years

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Net growth rate = (39.4 - 19.4) / 1000 = 20 / 1000 = 2%. Using the rule of 70 for doubling time: 70 / 2 = 35 years.

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