The third power reserved to the people is the mini-initiative. Any ordinance or amendment to any existing ordinance may be proposed to the Commissioners by filing with the Auditor petitions bearing the signatures of qualified voters equal in number to not less than 3 percent of the total votes cast at the last gubernatorial election immediately preceding the date of the registration of the petition. Upon verifying the sufficiency of the signatures, the Auditor shall transmit the petition to the Commissioners, who shall hold a public hearing on the proposed ordinance within 60 days and enact or reject the ordinance within 30 days thereafter. If the ordinance is rejected, no ordinance with the same intent shall again be proposed by mini-initiative as an ordinance by the people to the Commissioners within one year. Cost of publication and public notice shall be borne by the petitioners.