A FLSA covered enterprise is the related activities performed through unified operation or common control by any period or persons for a common business purpose and

Is an activity or a public agency

Whose annual gross volume of sales made, or business done is not less than $1,000,000

Is engaged in the operation of a hospital, an institution primarily engaged in the care of the healthy, the young, or mentally ill who reside on the premises; a school for mentally or physically disabled or gifted children; a preschool, an elementary or secondary school, or an institution of higher education