The audits for those agencies licensed under the provisions of Chapter 3 (commencing with Section 1500) of Division 2 of the Health and Safety Code shall include a sampling of the evidence of fees paid by families of nonsubsidized children, the average daily enrollment of subsidized and nonsubsidized children, the average number of days of service provided to subsidized children, and the services provided to subsidized children pursuant to the terms of the contract.