Type A has lower costs, and more profit each. If you sell 100 of them, you make 4500 dollars.
There is no way buying any type B can mimize cost.
Either you copied this problem wrong, or the author was either not thinking, or has no command of the subject of basic calculus.
Your computer supply store sells two types of laser printers. The first type, A, has a cost of $86 and you make a $45 profit on each one. The second type, B, has a cost of $130 and you make a $35 profit on each one. You expect to sell at least 100 laser printers this month and you need to make at least $3850 profit on them. How many of what type of printer should you order if you want to minimize your cost?
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