(a) Within 60 days after the expiration of each fiscal year the board shall make an annual report of its activities for the preceding fiscal year to the city. Each such report shall set forth a complete operating and financial statement covering its operation during such fiscal year. The board shall cause an audit of its books and accounts to be made at least once in each year by a certified public accountant or an auditor who is regularly employed by the State Examiner of Public Accounts, and the cost thereof may be treated as a part of the cost of operation.
(b) Any member, agent, or employee of the board who contracts with the board or is interested, either directly or indirectly, in any contract with the board or in the sale of any property, either real or personal, to the board shall be guilty of a misdemeanor.
(c) When all of the bonds and other obligations assumed by the board and all the revenue bonds issued by it shall have been fully paid or provisions for such payment shall have been made, then all properties, whether tangible or intangible, then owned and operated by the board shall become the property of the city, and all rights of the board in and to the same shall thereupon immediately vest in the city, and the board shall be automatically dissolved.