If the population doubles every 10 years, we have 90/10 = 9 doubling periods.

Our population function P(t) is where t is the doubling period

P(t) = 5(2^t)

The problem asks for P(9):

P(9) = 5(2^9)

P(9) = 5(512)

P(9) =

**2,560**

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