(2) The cost to the Department of Transportation of providing data processing, word processing and photocopy services, including labor, facilities, materials, overhead, administrative cost, the lease or purchase cost of the equipment and depreciation, to any state agency, including itself, which is to be charged, in part or whole to the agency or unit served may be advanced out of the Department of Transportation Working Capital Account. The costs advanced from the account shall be reimbursed to the account from the charges paid to the department by the agency or unit served. [1979 c.380 §§2,3; 1981 c.306 §1; 1989 c.966 §6]