A biologist studies the population of rats in a barn. He found that the average mortality was 240, average natality 250, immigration 20 and emigration 30. The net increase in population is
A
10
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B
15
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C
5
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D
Zero
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Solution
The correct option is C Zero Net increase in population can be calculated by a formula: (B+I) - (D+E) where in B refers to Birth rate/Natality, I refers to Immigration, D refers to Death rate/Mortality and E refers to Emigration. Therefore net increase for the population of rats in barn is (250+20) - (240+30), thereby 270-270. Hence net increase is zero and option D is correct answer.