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Math 11: Quadratic Functions - Max/Min Problem with Revenue of Calculators. Check the solution here: http://www.texttutoring.com/maxmin-problem-maximizing-revenue-selling-calculators/

Max/Min Problem - Maximizing Revenue Calculators are sold to students for 20 dollars each. 300 students are willing to buy them at that price. For every $5 increase in price, there are 30 fewer students