Let c(q) represent the cost and r(q) represent the revenue, in dollars, of producing q items. (a) if c(50)=4300 and c′(50)=21, estimate c(54) . c(54)=$ (b) if c′(50)=21 and r′(50)=36, approximately how much profit is earned by the 51st item? the profit on the 51st item is dollars. (c) if c′(100)=40 and r′(100)=36, should the company produce the 101st item? the company produce the 101st item. click if you would like to show work for th