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Question

A biologist studied the population of rats in a barn. He found that average natality was 250, average mortality was 240, immigration 20 and emigration 30. The net increase in population is


A
5
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B
0(zero)
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C
10
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D

15

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Solution

The correct option is B 0(zero)

Net increase in population = (average natality + immigration) - (averagemortality + emigration)

= (250 + 20) - (240 + 30)

= 270 - 270 = 0

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