The population $p$ of the city at time $t$ is given by $\frac{dp}{dt} = \frac{p}{2} - 100$. If the initial population at $t = 0$ is $100$,then $p$ is:

  • A
    $200 + 100 e^{t/2}$
  • B
    $200 - 100 e^{t/2}$
  • C
    $300 - 100 e^{t/2}$
  • D
    $300 + 100 e^{t/2}$

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