Quantity Discount : 28.75% to 36.25% off 5+ @ 28.75% : 1539.72 + 277.15 (18%) = 1816.87 10+ @ 32.50% : 1458.68 + 262.56 (18%) = 1721.24 15+ @ 36.25% : 1377.65 + 247.98 (18%) = 1625.63