A tax is imposed upon all persons engaged in the city in the business of making sales of service, including machinery and equipment, at the rate of one-half of one percent of the cost price of all tangible personal property transferred by the servicemen either in the form of tangible personal property or in the form of real estate as an incident to a sale of service, in accordance with the provisions of the Illinois Revised Statutes. (Ord. 458 § 2, 1980: prior code § 36-3-1)