`P(x)=10^6(1+(x-1)e^(0.001x))`
When in doubt take the derivative using the product property.
`P'(x)=10^6((x-1)(0.001e^(0.001x))+e^(0.001x))=10^6e^(0.001x)(0.001x+0.999)`
P'(x)=0 when (0.001x+0.999)=0
Solving for x =-999. This is the only critical points, but it is not possible to make -999 items.
We also have to check x=0 and x=2000
`P(0)=10^6(1+0e^(0.001x))=10^6`
`P(2000)=10^6(1+1999e^(0.001(2000))=10^6(1+1999e^2)~~1.477xx10^10`
` `The solution is to produce 2000 items.
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