Citrine Company manufactures two products, X and Y. The company has 200 pounds of materials and 500 direct labor hours available for production. The time requirements and contribution margins per unit are as follows:

	Product X	Product Y
Contribution margin per unit	$10	$8
Materials per unit (lbs.)	4	5
Direct labor hours per unit	2	4

Which of the following is the equation for the constraint on direct labor?

	a.	5X + 8Y 200
	b.	10X + 3Y 500
	c.	4X + 3Y 200
	d.	2X + 4Y 500