(a) In addition to the salary and expense allowance as may be fixed by law, the Fayette County Board of Education shall reimburse the reasonable travel and subsistence expense which the county Superintendent of Fayette County incurs in the performance of the duties of such office and in attending educational functions and meetings within and outside the county and state.
(b) The board shall fix the maximum amount to be expended for such travel and subsistence expense annually, the same to be paid upon claim filed by the superintendent out of any funds as may be available for such purpose.