In Elmore County, the members of the board of equalization shall be entitled to forty dollars ($40) a day for each day's service as provided by law. Such compensation shall be payable in equal monthly payments and be in lieu of any other compensation heretofore provided by law for such members. After the amount is paid as provided for in Sections 40-3-7 and 40-3-8, the remainder shall be paid from the general fund of the county.