N.J. Admin. Code § 2:52-7.2
The term "variable cost" as used in this subchapter shall include, but not be limited to, the basic cost of raw or reconstituted milk or derivatives thereof as determined in accordance with the joint State-Federal orders administered by the Division of Marketing and Development and the United States Department of Agriculture in the State of New Jersey; the cost of any added ingredients; and all other variable costs associated with the business of the dealer including the cost of material, labor, receiving, cooling, processing, manufacturing, storing and distributing the products sold; selling expense, maintenance charges, delivery expense, gifts, and free service allocated proportionately to each unit of product sold in accordance with generally accepted accounting principles. The proportioned allocation may be adjusted to reflect efficiencies in packaging different sized containers. Not included in these costs are office expense, salaries of executives and officers, interest, rent, depreciation, license fees, taxes, insurance, advertising, and advertising allowances.
N.J. Admin. Code § 2:52-7.2