Read the given passage and answer the following question.\ The density of a population in a given h

Question

Read the given passage and answer the following question.\ The density of a population in a given habitat during a given period, fluctuates due to changes in four basic processing. Changes in population density gives idea about the population whether it is flourishing or declining. ' $P$ ' refers to the number of births during a given period in a population that are added to the initial density while ' $Q$ ' is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration. ' $R$ ' is the number of deaths in the population during a given period. ' $S$ ' is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.\ If the total population in the given habitat is 1000 where $P$ is 100 and $R$ is 10 , calculate the growth rate $(r)$ for the population.\

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(b) : Percentage of growth rate $(r)$ is 
Birth $(P)=100$, Deaths $(R)=10$\ Growth $=P-R=100-10=90$\ $r=\frac{	ext { Birth }- 	ext { Deaths }}{	ext { Population size }} 	imes 100$\ $r=\frac{90 	imes 100}{1000}=9 \%$\