67.540.  Repeal or amendment of sales tax — procedure. — 1.  No county imposing a sales tax and property tax reduction pursuant to sections 67.500 to 67.545 may repeal or amend such sales tax and property tax reduction unless such repeal or amendment is submitted to and approved by the voters of the county in the manner provided in section 67.505.

  2.  Whenever the governing body of any county in which a county sales tax has been imposed in the manner provided by sections 67.500 to 67.545 receives a petition, signed by fifteen percent of the registered voters of such county voting in the last gubernatorial election, calling for an election to repeal such county sales tax, the governing body shall submit to the voters of such county a proposal to repeal the county sales tax imposed under the provisions of sections 67.500 to 67.545.  If a majority of the votes cast on the proposal by the registered voters voting thereon are in favor of the proposal to repeal the county sales tax, then the ordinance or order imposing the county sales tax, along with any amendments thereto and along with the property tax reduction imposed in conjunction with such sales tax, is repealed.  If a majority of the votes cast by the registered voters voting thereon are opposed to the proposal to repeal the county sales tax, then the ordinance or order imposing the county sales tax, along with any amendments thereto and along with the property tax reduction imposed in conjunction with such sales tax, shall remain in effect.