Quantity Discount : 28.70% to 36.21% off 5+ @ 28.70% : 634.41 + 114.19 (18%) = 748.60 10+ @ 32.46% : 601.02 + 108.18 (18%) = 709.20 15+ @ 36.21% : 567.63 + 102.17 (18%) = 669.80