Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 784.96 + 141.29 (18%) = 926.25 10+ @ 32.50% : 743.64 + 133.86 (18%) = 877.50 15+ @ 36.25% : 702.33 + 126.42 (18%) = 828.75