Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 301.91 + 54.34 (18%) = 356.25 10+ @ 32.50% : 286.02 + 51.48 (18%) = 337.50 15+ @ 36.25% : 270.13 + 48.62 (18%) = 318.75