bonjour
17 x 0.75 = 12.75
prix du tee shirt soldé = 12.75 €
prix hors solde = 34.50 + 17 = 51.50
prix soldés = 29.50 + 12.75 = 42.25
économie = 9.25
9.25/51.50 = 0.179611.... ≅ 18 %
