Quantity Discount : 28.76% to 36.25% off 5+ @ 28.76% : 59.77 + 10.76 (18%) = 70.53 10+ @ 32.51% : 56.63 + 10.19 (18%) = 66.82 15+ @ 36.25% : 53.48 + 9.63 (18%) = 63.11