really confused on these concepts!

A company produces and sells three products. This company has enough machine hours to make as many units as it can sell of its two most profitable products. If the company has the opportunity to rent as many more machine hours as it needs, what is the most it would be willing to pay_per machine hour? (Round to the nearest dollar and cents.) A company produces and sells three products. The company has only 560 direct labor hours per month and the monthly demand for each product is unlimited. What is the maximum total monthly contribution margin that the company can earn? (Make sure to calculate the total contribution margin, not the per-unit amount.)