The provisions of Section 21B-7.4 to the contrary notwithstanding, the following classifications of businesses, wherever located within the boundaries of the parking improvement area, shall pay an additional charge of one hundred percent of the business license tax:

(a) Any business, profession, occupation or service operating with a business license issued under Section 19-27 of this code. (Ord. No. 1902 (NCS), § 1.)