Since t = 0 corresponds to the year 2000, the value of t for the year 2220 is 2220 - 2000 = 220.
Substitute t = 220 into the equation:
$$P(220) = \frac{76.8}{6.4 + 5.7e^{-0.02(220)}}$$
$$P(220) = \frac{76.8}{6.4 + 5.7e^{-4.4}}$$
$$P(220) = \frac{76.8}{6.4 +
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