Announcement of Findings, Notice, Finality and Decisions of City Council. The city council shall announce its findings and decisions by formal written resolution within forty days after conclusion of the public hearing, or upon receipt of a planning commission report on the matter of referral thereto. Such resolution shall recite and set forth, among other matters, findings of fact, reasons and determinations which, in the opinion of the city council, make approval, conditional approval or denial of the proposed amendment considered necessary to carry out the general purpose and provisions of the zoning code and general plan, and shall approve, conditionally approve, or deny same. The city council, not more than ten days after concluding its action, shall transmit a copy of said resolution to the planning commission and applicant, as the case may be, and the actions and decisions of the city council shall be final and conclusive.