Whenever a vacancy shall occur in office of Mayor, as determined by the adoption of a "motion to determine vacancy" by a majority vote of the Council, the person serving as President Pro Tem of the Council shall have five days after the adoption of the motion to accept and qualify as the Mayor or to notify the Clerk of Council that he or she rejects succession to the office of Mayor. If the person holding the office of President Pro Tem rejects succession to the office of Mayor, the Council shall elect, by a majority vote, a qualified person to serve as the Mayor. The President Pro Tem or the person elected by the Council shall serve as Mayor until January 1 following the next regular municipal election, at which election a qualified person shall be elected Mayor from the City at large for either a full four year term or for the remainder of the term vacated by the person creating the vacancy, as appropriate. If, at the time the vacancy is determined, more than two years remain in the term of office and fewer than fifty days remain prior to the regular municipal election, the person who succeeds to the office of Mayor or the person elected by the Council shall serve for the remainder of the unexpired term.