In any case where the Commonwealth is required to reimburse any school district on account of pupil transportation and the school district, in lieu of such transportation, is authorized to and does pay for suitable board and lodging for any pupil, the Commonwealth shall pay to the school district an amount to be determined by multiplying the cost of such board and lodging by the districts aid ratio: Provided, that in no case shall the Commonwealth's share of the cost exceed one dollar ($1) per day per pupil for the actual number of days such pupil is in attendance at school, not exceeding five (5) days in any one week.
24 P.S. § 25-2542