The Department shall have authority to enter into agreements with units of local government or individuals with the approval of the Attorney General, for the collection of monies owing because of the failure of parents or guardians to pay charges to the Department for the care and training of their children. Such agreements may be on a contingent fee basis, but such contingent fee shall not exceed 20% of the total amount collected.
     The Department may also enter into agreements with local governmental units to exercise the investigative and enforcement powers designated in Section 9.8.