Dynondo's Brakes manufactures three different product lines, Model X, Model Y, and Model Z. Considerable market demand exists for all models. The following per unit data apply:

	Model X	Model Y	Model Z
Selling price	$53	$63	$71
Direct materials	9	9	9
Direct labor ($15 per hour)	15	15	30
Variable support costs ($7 per machine-hour)	7	14	14
Fixed support costs	12	12	12

Which model has the greatest contribution margin per machine-hour?

		Model X
		Model Y
		Model Z
		Both Model X and Model Y have the highest and same contribution margin per machine-hour