All else equal, a $3.00 increase in a product's variable expense per unit accompanied by a $3.00 increase in its selling price per unit will: more than one of the answers is correct decrease the contribution margin. have no effect on the break-even volume. have no effect on the contribution margin ratio. increase the number of units that need to be sold to reach a target profit of $50,000 decrease the degree of operating leverage. none of the answers are correct