In addition to any taxes now authorized or that may hereafter be authorized by the constitution and laws of the State of Alabama, pursuant to Amendment 373 to the Constitution of Alabama of 1901, an increase of the district ad valorem school tax presently being levied pursuant to Amendment 3 to the Constitution of Alabama of 1901, at the adjusted rate of three and one-half mills in the City of Arab School District (the boundaries of which district are coterminous with the corporate limits of the city) in Marshall County from the present millage to the rate of one dollar thirty cents ($1.30) on each one hundred dollars ($100) worth (13 mills) of taxable property in the City of Arab School District is approved; such increased district ad valorem tax to be levied and collected by the governing body of Marshall County for each year beginning with the levy for the tax year ending September 30, 1988 (the tax for which year will be due and payable October 1, 1988), and ending with the levy for the tax year ending September 30, 1992 (the tax for which year will be due and payable October 1, 1992), for public school purposes; provided, that the aforesaid increased rate of such tax, the time it is to continue, and the purpose thereof shall have been first submitted to the vote of the qualified electors of the City of Arab School District, and voted for by a majority of those voting at a special election called and held in accordance with the law governing special elections.