Quantity Discount : 24% to 32% off 5+ @ 24% : 4260.51 + 766.89 (18%) = 5027.40 10+ @ 28% : 4036.28 + 726.53 (18%) = 4762.81 15+ @ 32% : 3812.04 + 686.17 (18%) = 4498.21