An independent audit shall be made of all accounts of the township government at least annually and more frequently if deemed necessary by the township board. Such audit shall be made by qualified accountants experienced in municipal accounting. The results of such audit shall be on file in the office of the township clerk and available to the public for inspection. An annual report of the township business shall be made available to the public by the township board in such form as will disclose pertinent facts concerning the activities and finances of the township government.