Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 754.77 + 135.86 (18%) = 890.63 10+ @ 32.50% : 715.04 + 128.71 (18%) = 843.75 15+ @ 36.25% : 675.32 + 121.56 (18%) = 796.88