(a) The state board shall promulgate a rule pursuant to the provisions of 29A-3B-1 et seq. of this code setting forth requirements for public charter school funding. The rule shall include a requirement that 90 percent of the per pupil total basic foundation allowance follow the student to the public charter school, subject to the following:
(1) Notwithstanding 18-9A-1 et seq. of this code, the rule may provide for modifications to the calculations set forth in 18-9A-7 of this code regarding the allowance for student transportation and in 18-9A-9(1) of this code regarding the allowance for current expense for the purpose of making appropriate adjustments to those allowances to account for student transportation and current expense related funding a school district loses in situations where it pays money to a public charter school pursuant to this subsection without a corresponding decrease in the countys transportation and current expense related expenditures;