257.41  Funding for programs for returning dropouts and dropout prevention.
  The budget of an approved program for returning dropouts and dropout prevention for a school district, after subtracting funds received from other sources for that purpose, shall be funded annually on a basis of one-fourth or more from the district cost of the school district and up to three-fourths by an increase in allowable growth as defined in section 257.8. Annually, the department of management shall establish a modified allowable growth for each such district equal to the difference between the approved budget for the program for returning dropouts and dropout prevention for that district and the sum of the amount funded from the district cost of the school district plus funds received from other sources.
89 Acts, ch 135, §41