From Wikipedia, the free encyclopedia. Phototoxicity, also called photoirritation, is a chemically induced skin irritation, requiring light, that does not involve the immune system. It is a type of photosensitivity. The skin response resembles an exaggerated sunburn.
The contribution margin ratio is the difference between a company's sales and variable expenses, expressed as a percentage. The total margin generated by an entity represents the total earnings available to pay for fixed expenses and generate a profit.
A product's contribution margin per unit is the excess of the selling price per unit over the variable cost of obtaining and selling each unit. TRUE. The contribution margin derived from different products is not used to motivate the sales force to increase sales of the most profitable products.