Helmer's Rockers manufactures two models, Standard and Premium. 100 units of the Standard Model and 100 units of the Premium are the max the company can sell in a week. The following per unit data apply: Standard Premium Contribution margin per unit $18 $20 Number of machine-hours required 3 1. Calculate the contribution per machine-hour for each model. 2. If there are 496 machine-hours available per week, how many rockers of each model should the Company produce to maximize profits? Show your calculation