9.2 divided 3.2

please give steps

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Sorry im lazy to solve it on paper

In order to solve this problem, you must know how to derive a function. You are given p(x) = -0.1x² + 80x - 60. Derive this in the first degree then you will have p'(x) = -0.2x + 80 then equate this to zero and you will have a number of units of 400. At 500 units, your profit, by substituting 500 to p(x) = -0.1x² + 80x - 60, will become 14,940.