Posted by **tina** on Monday, March 14, 2011 at 7:41am.

(Px – 20) (100 – 2 Px + Pyg)

Differentiating with respect to P we get

100 – 4Px + Pyg + 40 = 0

I don't understand how this is calc... whenever I multiply through and take the deriv I get another answer. Do you first multiply Px through then 20??

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