When the working time provided for in the employee’s contract of employment or in the prisoner’s employment contract is less than thirty-five hours per week, the amount of aid for the post occupied by the employee is reduced by applying the ratio between the working time provided for in the contract or in the prisoner’s employment contract and:
1° The collective working time applicable to the employing body if this is at least thirty-five hours per week ;
2° Thirty-five hours if the collective working time applicable to the employing body is less than thirty-five hours per week.