(1) Your "usual hours" will be determined based on:

(a) The hours of work agreed on by you and your employer as part of your individual hiring agreement;

(b) For seasonal jobs, the number of hours you customarily work during the season; or

(c) For piecework, the number of hours you customarily work to complete a fixed volume of work.

(2) To constitute good cause for quitting under this section, employer action must have caused the reduction in your usual hours.

(3) All reductions in hours occurring since the beginning of your base period through the date of separation will be included in the determination as to whether your hours were reduced by twenty-five percent or more.

(4) In determining the percentage of reduction, the department will not consider any temporary overtime or additional hours performed on a temporary basis.