(a) Each member of the Limestone County Board of Education shall receive an additional expense allowance in the amount of two hundred fifty dollars ($250) per month. This expense allowance shall be in addition to any other expense allowances provided by law.
(b) Beginning with the next term of office, the monthly salary for each member of the Limestone County Board of Education shall be increased by two hundred fifty dollars ($250) payable in equal monthly installments from the general fund of the county and at that time, subsection (a) shall be inoperative.