Source: https://www.devoirat.net/app/download/10939943552/S%C3%A9rie+d%27exercices+N%C2%B02+-+Gestion+-Gestion+de+l%27approvisionnement+-+Bac+Economie+%26+Gestion+%282019-2020%29+Mme+Aben+S.pdf