In addition to all other taxes of every kind now imposed by law, there is levied in all areas of Escambia County, except within the existing corporate limits of the municipalities of Atmore, Brewton, East Brewton, Flomaton, Riverview, and Pollard a privilege or license tax, a consumers' use tax, and a sellers' use tax of three percent on business activity against gross sales or gross receipts of a business, as the case may be. In any police jurisdiction where a tax is currently being levied and collected by a municipality, the additional tax herein levied shall be at a rate equal to three percent reduced by the percent of the current levy. Sales of automobiles, agricultural equipment, forestry equipment, manufacturing equipment, and manufactured homes shall be exempt from the additional tax levied herein.