Quantity Discount : 23.98% to 31.98% off 5+ @ 23.98% : 35.43 + 6.38 (18%) = 41.81 10+ @ 28% : 33.56 + 6.04 (18%) = 39.60 15+ @ 31.98% : 31.70 + 5.71 (18%) = 37.41