(A) For each child enrolled in a college-preparatory boarding school, as reported under section 3328.31 of the Revised Code, the department of education and workforce shall pay to the school the sum of the amount eighty-five per cent of the operating expenditure per pupil of the city, local, or exempted village school district in which the child is entitled to attend school plus the per-pupil boarding amount specified in division (B) of this section. As used in this division, a district's "operating expenditure per pupil" is the total amount of state payments and other nonfederal revenue spent by the district for operating expenses during the previous fiscal year, divided by the district's enrolled ADM, as that term is defined in section 3317.02 of the Revised Code, for the previous fiscal year.