The proceeds from the sale of products shall be credited to the institution or facility where the products were produced, deposited in a revolving fund, and expended for the purchase of supplies, materials, and equipment for use in vocational education programs. The proceeds from the sale of services shall be credited to the institution or facility where the services were performed, and may be expended for the purchase of supplies, materials, and equipment for use in vocational education programs, and for the payment of wages earned by students in performing services.