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