(1) School districts are required to grant salary increases in the percentages specified in § 1, chapter 169, Laws of 1965, Ex. Sess., "subject to the availability of funds for all district functions." (2) Same: The prescribed percentage increases are to be determined on the basis of the average salary in the individual districts. (3) Same: The percentage increase need not be granted to each employee of the district but the "average" salary increase must be in the percentage specified "subject to the availability of funds for all district functions." (4) The basis for computing the percentage increase for the 1966-67 school year is the average salary paid in the district in the 1964-65 school year.