Rates, fees, and charges for public transportation service rendered by the authority from any of its transit systems shall be fixed and from time to time revised as at all times to provide funds that, when added to all other revenues (including tax proceeds) anticipated to be received by the authority, will be at least sufficient:
(1) To pay the cost of operating, maintaining, repairing, replacing, extending, and improving systems from which such services are rendered;
(2) To pay the principal of and the interest on all bonds issued and obligations assumed by the authority, that are payable out of the revenues derived from operation of those systems, as the said principal and interest become due and payable;
(3) To create and maintain such reserve for the foregoing purposes or any of them as may be provided in any mortgage and deed of trust or trust indenture executed by the authority hereunder or in any resolutions of the board authorizing the issuance of bonds, the assumption of any obligation, or the acquisition of any such system; and
(4) To make such annual payments, if any, to the United States of America or any agency or instrumentality thereof, the state, municipalities, counties, departments, authorities, agencies, and political subdivisions of the state and any public corporations organized under the laws of the state as the authority may have contracted to make.