147. A lawyer advertising lump-sum fees must:(
(1) establish fixed prices;
(2) specify the nature and extent of the professional services included in the fees and, where applicable, any other services included therein;
(3) indicate whether disbursements and taxes are included in the fees; and
(4) indicate whether other professional services might be required which are not included in the fees.
The details and indications must be of such a nature as to adequately inform persons who have no particular knowledge of the field of law.