Contributions are made up of:
1° A fraction of the amount of wages paid to permanent employees by member companies, plus holiday pay for which a contribution is collected by the holiday pay funds set up in the building and public works sector;
2° A contribution in respect of temporary employees made available to these companies. This contribution is based on the product obtained by multiplying the number of hours worked by the temporary employees made available by the member companies by the reference salary set under the conditions provided for in article R. 4643-38.