In making its annual levy for public school purposes, it shall be the duty of the council to separately specify the sum to be used for the maintenance of the public schools other than the high school branch thereof, the maintenance of the high school department of schools containing such department and the sum to be used for new buildings and equipment of the public schools of the county; provided, that the council may levy a contingent fund which may be applied to maintenance, high schools, new buildings or equipment in the discretion of the county board of education; and, provided further, that it shall be mandatory on the council to levy for each school year a sum which, together with the estimated state apportionment therefor, will be sufficient to lawfully maintain the public schools of the county other than high schools for the period for which each class of such schools were conducted in the school year ending July 31, 1913. (Mont. Co. Code 1965, § 21-9; 1914, ch. 361, § 524B.)