Helmer's Rockers manufactures two models, Standard and Premium. Weekly demand is estimated to be 101 units of the Standard Model and 70 units of the Premium Model. The following per unit data apply: Contribution margin per Number of machine-hours required Standard $18 Premium $20 4 If there are 491 machine-hours available per week, how many rockers of each model should Jim Helmer produce to maximize profits? 70 units of Standard and 70 units of Premium 101 units of Standard and 47 units of Premium 101 units of Standard and 70 units of Premium O 82 units of Standard and 61 units of Premium