Quantity Discount : 24% to 32% off 5+ @ 24% : 4222.51 + 760.05 (18%) = 4982.56 10+ @ 28% : 4000.28 + 720.05 (18%) = 4720.33 15+ @ 32% : 3778.04 + 680.05 (18%) = 4458.09