71828).
In this case, $P = 6400$, $r = 0.06$, and $t = 3$. Plugging these values into the formula, we get:
$A = 6400 \cdot e^{(0.06)(3)}$
$A \approx 7622.50$
So the amount after 3 years is $\boxed{7622.50}$.
(b) To find how long it will take for the amount to
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