There shall be a Planning Commission of five members. One shall be Mayor, one shall be a member of Council, elected by the Council, whose term on the Planning Commission shall expire at the next reorganization meeting of the Council. Three citizen members shall be appointed by the Mayor, with the approval of the Council, for four-year staggered terms, and shall serve without compensation. The Manager shall be an ex-officio member without a vote. The Planning Commission shall perform such duties as prescribed by this Charter, ordinances of the municipality or state law, and in addition shall serve as the platting commission of the municipality.