In each township in this state, organized under the provisions of this chapter, there shall be a board of directors, composed of the township trustee and members of the township board, whose duty it shall be:
(1) To audit all accounts of township officers for services rendered as such officers;
(2) To audit all other accounts or demands legally presented to them against the township;
(3) To levy all taxes for township, road and bridge purposes, and all other duties provided by this chapter for the township board of directors to perform.