A small tool manufacturer produces a standard and cordless model power drill. The standard model takes 2 hours of labor to assemble and the cordless model 3 hours. There are 72 hours of labor available per week for the drills. Material costs for the standard drill are $10, and for the cordless drill they are $20. To maximize profits, the company wished to limit material costs to $420 each week. How many of the cordless drills should be produced to use all of the available resources? Let y = cordless drills