Quantity Discount : 33.50% to 40.50% off 5+ @ 33.50% : 79.16 + 3.96 (5%) = 83.12 10+ @ 37% : 75 + 3.75 (5%) = 78.75 15+ @ 40.50% : 70.83 + 3.54 (5%) = 74.37