Question 380578
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Hi
Question states:
selling price of 60 of a certain stereo = 150*60 = $9000
The total cost of making 60 stereos = 90*60-0.02(60)^2 = 5400 - 72 = $5328

Percent markup is ($9000-$5328)/$5328 * 100 = 68.9 %