The County Commission of Lamar County shall provide such additional amount of daily compensation as is necessary to grant each election clerk, inspector, and returning officer of elections a total compensation of twenty-five dollars ($25), and shall increase the mileage allowance of the returning officer to fifteen cents ($.15) a mile in going to the courthouse and returning to the place of holding the election. Such compensation and mileage shall be paid out of any funds in the county treasury available for such purposes.