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(A) The formula for population change is given by: $N_{t+1} = N_t + [(B + I) - (D + E)]$, where $N$ is population size, $B$ is births, $I$ is immigrat

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(A) The formula for population change is given by: $N_{t+1} = N_t + [(B + I) - (D + E)]$, where $N$ is population size, $B$ is births, $I$ is immigration, $D$ is deaths, and $E$ is emigration.Net increase = $(Births + Immigration) - (Deaths + Emigration)$.Given values: $Births (B) = 250$, $Deaths (D) = 240$, $Immigration (I) = 20$, $Emigration (E) = 30$.Net increase = $(250 + 20) - (240 + 30)$.Net increase = $270 - 270 = 0$.Therefore, the net increase in the population is $0$.

$A$ biologist studied a rat population at the time of birth. He observed that the estimated births were $250$, estimated deaths were $240$, $20$ rats immigrated into the population, and $30$ rats emigrated from the population. What was the net increase in the population?

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