Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 905.72 + 163.03 (18%) = 1068.75 10+ @ 32.50% : 858.05 + 154.45 (18%) = 1012.50 15+ @ 36.25% : 810.38 + 145.87 (18%) = 956.25