If the period during which an employer, pursuant to the provisions of the preceding Article, has had a worker work falls within, but is shorter than, the applicable period, and during that period, the employer has had that worker work an average of more than 40 hours per week, the employer must pay the worker premium wages for time worked in excess of the 40-hour-per-week average (other than time by which the employer has extended working hours or the time that the employer has had the worker work on a day off, pursuant to the provisions of Article 33 or Article 36, paragraph (1)) as provided for in Article 37.