The Council may by a vote of at least 2/3 vote of all its members; submit to the electors of the Municipality amendments to this Charter; and, upon petition being presented to Council setting forth a proposed amendment, signed by not less than that number of resident and qualified electors of the Municipality which equal ten (10) percent of the number of qualified electors of the Municipality.  Such proposed amendment shall be submitted to the electors of the Municipality for adoption or rejection.  The submission of a proposed amendment to the electors shall be governed by the provisions of the Constitution of the State of Ohio, and to such extent as the Constitution shall fail to provide therefor, the Council shall determine the manner of such submission.  If any amendment so submitted is approved by a majority of the electors voting thereon, its provisions shall be incorporated into this Charter; except that if two or more inconsistent amendments on the same subject matter are submitted at the same election, only the one receiving the largest affirmative vote, not less than a majority, of the votes cast on the subject matter, shall become incorporated into this Charter.