P(t) = Po b^t
P(2) = Po/2 ci porta a
Po/2 = Po * b^2
b^2 = 1/2
b = (1/2)^(1/2)
P(t) = 5000 * (1/2)^(t/2)
P(4.5) = 5000 * 0.5^(4.5/2) = 1051.1 ~ 1051
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