If, in carrying out any of such functions as provided for in section 37-1 or 37-2, the county executive utilizes the services of any existing private social welfare agency, such public official as the county executive may designate shall be a member of the managing board or any executive committee of such agency and shall keep the county executive at all times informed as to the manner of expenditure of any public funds by such agency, and such agency shall make an annual report of all its receipts and expenditures to the county. (Mont. Co. Code 1965, § 20-3; 1933, ch. 444, § 240A; 1971 L.M.C., ch. 17, § 2.)