Tanek Industries manufactures and sells three different models of wet-dry shop vacuum cleaners. Although the shop vacs vary in terms of quality and features, all are good sellers. Tanek is currently operating at full capacity with limited machine time. Sales and production information relevant to each model follows.

		Product
		Economy		Standard		Deluxe
Selling price		$45		$75		$149
Variable costs and expenses		$24		$30		$69
Machine hours required		0.5		0.8		1.6

(a1)

Calculate contribution margin per unit.

		Product
		Economy		Standard		Deluxe
Contribution margin per unit		$		$		$