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Profit maximization HELP!

I'm sure I need to use calculus to solve this - but I'm not too sure where to start - please see attachment. Thanks for any help.
Original post by HypothesisK
I'm sure I need to use calculus to solve this - but I'm not too sure where to start - please see attachment. Thanks for any help.


Differentiate, find the zeros thereof. Maximum occurs when the second derivative is less than 0.

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