Question 1173375
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Your formulation is FATALLY WRONG,


and I came to fix it.


See my editing below.



<pre>
    A small manufacturing makes and sells x machines each month. The monthly cost, C ,in dollars, 
    of making x {{{highlight(cross(dollars))}}} <U>MACHINES</U> is given by

        C(x)= 0.35x^2 + 3200

    The monthly revenue, R, in dollars, obtained by selling x machines is given by

        R(x)= 180x - 0.55x^2

    If the company does maximum profit what is the selling price of each machine?
</pre>