(a) A territorial unit shall be the territory under the jurisdiction of a city or village superintendent or district superintendent; a school district within a supervisory district having at least 75 members of the system, including a board of cooperative educational services and a vocational education and extension board; the State Education Department; or a unit of the State University.

(b) Each territorial unit shall be entitled to a minimum of one delegate for each 200 members of the system contractually employed on a per annum basis. For the purposes of this section, per annum basis shall mean credited with a full year of service in said unit. The number of delegates to which each territorial unit shall be entitled shall be equal to the number of such members divided by 200 rounded to the nearest whole number as determined according to the following schedule:

a unit having fewer than 300 members shave have one delegate;

a unit with 300-499 members shall have two delegates;

a unit with 500-699 members shall have three delegates;

a unit with 700-899 members shall have four delegates;

a unit with 900-1099 members shall have five delegates;

a unit with 1100-1299 members shall have six delegates; etc.