1. A recall petition shall be filed with the election authority not more than one hundred eighty days after the filing of the notice of intention.

2. The number of qualified signatures required in order to recall an officer shall be equal in number to at least twenty-five percent of the number of voters who voted in the most recent gubernatorial election in that district.

3. Within twenty days from the filing of the recall petition the election authority shall determine whether or not the petition was signed by the required number of qualified signatures. The election authority shall file with the petition a certificate showing the results of the examination. The authority shall give the proponents a copy of the certificate upon their request.

4. If the election authority certifies the petition to be insufficient, it may be supplemented within ten days of the date of certificate by filing additional petition sections containing all of the information required by section 321.709 and this section. Within ten days after the supplemental copies are filed, the election authority shall file with it a certificate stating whether or not the petition as supplemented is sufficient.

5. If the certificate shows that the petition as supplemented is insufficient, no action shall be taken on it; however, the petition shall remain on file.