Once a company hits its breakeven point, net operating income will increase by an amount equal to:

	a.	The contribution margin ratio multiplied by total variable expenses.
	b.	The contribution margin ratio multiplied by the number of units sold above the break-even point.
	c.	The contribution margin per unit multiplied by the number of units sold above the break-even point.
	d.	The contribution margin ratio multiplied by the total sales dollars for the period.