67.721.  Repeal or amendment of sales tax, procedure. — 1.  No county imposing a sales tax pursuant to sections 67.700 to 67.727 may repeal or amend such sales tax unless such repeal or amendment is submitted to and approved by the voters of the county in the manner provided in section 67.700.  An amendment to such tax may include a revision of the rate which may be levied and capital improvements purpose which the proceeds of the tax may be used for.

  2.  Whenever the governing body of any county in which a county sales tax has been imposed in the manner provided by sections 67.700 to 67.727 receives a petition, signed by ten 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 67.700 to 67.727.  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the county sales tax, then the ordinance or order imposing the county sales tax, along with any amendments thereto, is repealed.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, shall remain in effect.