His business has gone down 85%, which his livelihood and his family's livelihood was dependent upon, because it's not only firearms; it's related, and so is the equipment that goes with the business.
Son chiffre d'affaires a baissé de 85 p. 100; c'est son gagne-pain, le gagne-pain dont dépend sa famille. Il ne vend pas que des armes; il vend aussi de l'équipement connexe.