$11\mathrm{.}1-6.$ Vincent Cardoza is the owner and manager of a machine shop that does custom order work. This Wednesday afternoon, he has received calls from two customers who would like to place rush orders. One is a trailer hitch company which would like some custom$-$made heavy$-$duty tow bars. The other is a mini$-$car$-$carrier company which needs some customized stabilizer bars. Both customers would like as many as possible by the end of the week $($two working days$).$ Since both products would require the use