Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 126.20 + 22.72 (18%) = 148.92 10+ @ 32.50% : 119.56 + 21.52 (18%) = 141.08 15+ @ 36.25% : 112.91 + 20.32 (18%) = 133.23