90. Breaking Even Midtown Sporting Goods has determined that it needs to sell its soccer shinguards for 5.25apairinordertobecompetitive.Itcosts\4.32 to produce each pair of shinguards, and the weekly overhead cost is 4000$.
(a) Express the average cost that includes the overhead of producing one shinguard as a function of the number x of shinguards produced each week.
(b) Solve algebraically to find the number of shinguards that must be sold each week to make 8000$ in profit. Support your work graphically.