Can someone help with the last part of this question?

Crane Tek produces three models of professional swim goggles. Jet and Spirit-both with fog-free acrylic lenses. Crane Tek ha the following information regarding the products for the month of July: If Crane Tek were able to get an additional 7,840 machine hours, but only has demand for the current production in units, which combination of products should it produce? If Crane Tek is limited to 3,100 machine hours, what is the contribution margin per machine hour for three model? (Round answers to 2 decimal places, e.g. 75.25.)