In this section, “business” means a trade, professional activity, or other business that is conducted for profit. Before a unit adopts a proposed regulation, the unit shall evaluate whether the proposed regulation has any impact on businesses. To evaluate the impact, the unit shall: on the basis of the sizes of the businesses that the proposed regulation might affect, divide those businesses into any classes that the unit considers appropriate for the proposed regulation; and particularly consider: the costs that the proposed regulation would impose on each class; and the difficulty of compliance for each class. On the basis of the evaluation, the unit may adopt 1 or more regulations that apply differently to classes of businesses.