Logistic-growth equation rate of change

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$\frac{I}{I-50000}=Ce^{kt}$

Where the constants C and k can be deduced from known values. However I am unable to solve for $I$ in a way which leaves a workable function

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Your equation $$\frac{dI}{dt} \propto I(50000-I)$$ is a separable equation.

$$ \frac {dI}{I(50000-I)}=cdt$$

$$ \int \frac {dI}{I(50000-I)}=c\int dt$$

Partial fraction $$\int (\frac {1}{I}+\frac {1}{50000-I})dI=50000ct+k$$

$$\ln \frac {I}{50000-I} = 50000ct+k$$

$$ \frac {I}{50000-I}=Ke^{rt}$$

Cross multiply and solve for $I$ to get $$ I = \frac {50000Ke^{rt}}{1+Ke^{rt}} $$