Aurum Appliances manufactures three sizes of kitchen appliances: small, medium, and large. Product information is provided below. Small Medium Large Unit selling price $450 $620 $1210 Unit costs Variable manufacturing (300) (530) Fixed manufacturing (150) (270) Fixed selling and administrative (80) (130) Unit profit $20 $280 (260) (90 Demand in units Machine-hours per unit 160 110 40 110 110 The maximum machine-hours available are 6100 per week. What is the contribution margin per machine-hour for a medium appliance? $8.00 $0.59 $13.13 $2.38