91.7. Paragraph c of section 224 of the Act does not apply to a merchant who is a member of an association referred to in section 91.6 with respect to goods or services sold in an establishment referred to in that section where the only difference between the advertised price and the price charged for the goods or services is an amount representing a percentage of the contribution payable to the association of which he is a member, provided that the following conditions are met:(a) the invoice or cash receipt given to the consumer, for each transaction, indicates the percentage of the contribution payable to the association of which he is a member, and the amount that percentage represents, that has been applied and added to the advertised price of the goods sold or services provided;
(b) the notice prescribed in subparagraph b of the second paragraph of section 91.6 must be posted in accordance with the requirements of that section for the goods or services sold in his establishment; and
(c) any advertising at the merchant’s specific request about goods or services sold in his establishment must indicate that an amount representing a percentage of the contribution payable to the association of which he is a member will be added to the advertised price and must state the percentage and the name of the association.