Biologist studied the population of rats in a barn initially the number of rate were 200 now 15 new rats were born and average mortality was 20. So, what will be the final population?

200

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195

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220

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185

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Solution

The correct option is B 195
Population growth rate (PGR) is the increase in a country's population during a period of time, usually one year, expressed as a percentage of the population at the start of that period. It reflects the number of births and deaths during a period and the number of people migrating to and from a country.
As there are 200 rats at initial stage, birth rate is 15 and death rate is 20, therefore total population of rats in Barn - 200+15-20=195.
Therefore, the correct answer is option B.

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