Quantity Discount : 29% to 36.47% off 5+ @ 29% : 59.57 + 10.72 (18%) = 70.29 10+ @ 32.73% : 56.44 + 10.16 (18%) = 66.60 15+ @ 36.47% : 53.30 + 9.59 (18%) = 62.89