`P(t) = 100(e^-t-e^(-4t))`

To find the maximum percentage we first find the critical points when `(dP(t))/(dt) =0`

`(dP(t))/(dt) = 100(-e^-t+4e^(-4t)) = 0`

We divide both sides by 100 and move the `e^-t` to the other side...

(The entire section contains 112 words.)

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