Quantity Discount : 24% to 31.99% off 5+ @ 24% : 83.73 + 15.07 (18%) = 98.80 10+ @ 27.99% : 79.33 + 14.28 (18%) = 93.61 15+ @ 31.99% : 74.92 + 13.49 (18%) = 88.41