§ 7.02. POWER OF REFERENDUM:

  The voters shall have power to approve or reject at the polls any ordinance passed by the Council or submitted by the Council to a vote of the voters, such power being known as the referendum, except in cases of bond ordinances and ordinances making the annual tax levy. Ordinances submitted to the Council by initiative petition and passed by the Council without change shall be subject to the referendum in the same manner as other ordinances. Within twenty (20) days after the enactment by the Council of any ordinance which is subject to a referendum, a petition signed by currently qualified voters of the City equal in number to at least twenty (20) percent of the total number of the votes cast at the last general city election or 250, whichever is greater, may file with the City Secretary requesting that any such ordinance be submitted to a vote of the voters.