An amendment to the charter may be submitted to the electors by either of the two following methods:
(a) Council may, by the affirmative vote of at least two thirds of its members, submit any proposed amendment to this charter to the electors.
(b) Council shall submit any proposed amendment to the electors upon receive of a petition signed by not less than ten percent of the qualified electors of the City setting forth any proposed amendment to the charter.
Council shall determine the manner of the submission of any proposed amendment to the electors to the extent that such submission is not governed by the Constitution and laws of Ohio. If any such proposed amendment shall be approved by a majority of the electors voting thereon, it shall become a part of this charter; except that if two or more inconsistent proposed amendments on the same subject shall be submitted at the same election, only the one of such amendments receiving the largest affirmative vote, not less than a majority, shall become a part of this charter.