Xcelerate Productions Limited manufactures and sells three different products of different qualities. They are referred to as: Normal, High, and Superior. The accounting department provides the following information on these products:

Normal High. Superior

Selling price per unit $30 $41 $52

Variable costs per unit $25 $35 $48

Contribution margin per unit. $5. $6 $4.

Machine hours required 0.02. 0.04 0.08

If the limited resource can be increased by 600 hours, how can the company maximize the overall contribution margin?