Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 483.05 + 86.95 (18%) = 570 10+ @ 32.50% : 457.62 + 82.37 (18%) = 539.99 15+ @ 36.25% : 432.20 + 77.80 (18%) = 510