Quantity Discount : 23.98% to 31.98% off 5+ @ 23.98% : 32.21 + 5.80 (18%) = 38.01 10+ @ 28% : 30.51 + 5.49 (18%) = 36 15+ @ 31.98% : 28.82 + 5.19 (18%) = 34.01