Question 1118928
What do you want from the profit function?  Roots (zeros)?  Maximum?


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{{{-5x^2+1000x+5000}}}
{{{-5(x^2-200x-1000)}}}
{{{-5(x^2-200x+10000-10000-1000)}}}
{{{-5((x-100)^2-11000)}}}
{{{-5(x-100)^2+55000}}}
The maximum point is (100, 55000).