Respuesta :

x=quantity soldunit Price,P=140-0.001xunit Cost, C=40x/150000total Revenue, R=xPProfit, Pr where
Pr=R-C=xP-C=x(140-0.001x)-40x/150000=140x-0.001x^2-40x/150000
To maximize profit,Pr'=0140-0.002x-40/150000=>x=70,000 units