Single variable functions optimization

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The cost of producing appliances is $\$(300 + 2.2n^2)$ where $n$ is the number produced per week. If they are sold for $\$110$ each, how many should be produced for maximum profit?

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Hint: Suppose you produce and sell $n$ of them, then your revenue is $110n$ and your cost is $300+2.2n^2$, so your profit (which is revenue minus cost) is $$110n-\left(300+2.2n^2\right).$$

Do you know how to maximise this expression over $n\ge 0$?