1-33-50. Internal service fund for data processing--Use of revenues--Maximum operating balance. There is hereby established in the state treasury a data processing internal service fund. Any receipts or revenues into said fund may be expended for the purpose of defraying the expenses of the data processing services provided by the service agency authorized by § 1-33-45. The fee schedule for services rendered by the service agency shall provide for a maximum operating balance of two months' average operating expenditures incurred by such operation. This average shall be calculated on an accrual basis and shall be double a moving monthly average of the twelve months' operating expenditures preceding the month of operation.