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The population of a town is 20,000. If the annual birth rate of is 4% and annual death rate is 2% calculate the population after two years.

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30808

20808

20000

None of these

answer is B.

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Detailed Solution

Concept- In order to solve the problem given above , first find the population increase and then find the final population after two years .
Here,
Annual birth rate=4%
Annual death rate=2%
And,

net = + 2 %

Then, the population after the 2 years will be,

= {(1 + 0.02)}^{2} \times 20000

= {(1.02)}^{2} \times 20000

= 1.0404 \times 20000

= 20808

Hence, the correct answer is option 2.

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