12 is 60% of 20. You can make 60% into a fraction (60/100) and set that fraction equal to 12/x. You then cross multiply (12*100 and 60*x) to get 1200=60x. You then divide both sides by 60 to get x, which equals 20.
Based on the quadratic model, approximately what number of salespeople maximizes the company's profits?
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