Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 298.89 + 53.80 (18%) = 352.69 10+ @ 32.50% : 283.16 + 50.97 (18%) = 334.13 15+ @ 36.25% : 267.43 + 48.14 (18%) = 315.57