Find the value of the objective function at each corner point of the graphed region.

A toy maker makes two plastic toys, the Ring ( \(x\) ) and the Stick ( \(y\) ). The toy maker makes \(\$ 4\) per Ring and \(\$ 6\) per Stick. The Ring uses 3 feet of plastic, while the Stick uses 5 feet of plastic. Today the toy maker has 40 feet of plastic available. The toy maker also only makes 10 plastic toys per day. To maximize profit, how many of each toy should the toy maker make?