Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 875.53 + 157.60 (18%) = 1033.13 10+ @ 32.50% : 829.45 + 149.30 (18%) = 978.75 15+ @ 36.25% : 783.37 + 141.01 (18%) = 924.38