All associations formed under the provisions of section 357.010, shall keep a set of books showing the business operation of said association, and said books shall be audited by competent auditors once each year; which auditor shall not be a member or stockholder of said association. At the completion of the audit herein provided for, said auditor shall have the right to call a meeting of the board of directors, and explain his report and the financial condition of said association, and a copy of the report of said auditor shall be filed with the secretary and president of the board of directors of such an association, which report may contain recommendations for the proper handling of the business of said association.