If the selling price is marked up by 25 percent, the new price will be $10. 8 * 1.25 = 10 If the selling price is marked up by 70 percent, the new price will be $13.60. 8 * 1.70 = 13.6 If the selling price is marked up by 75 percent, the new price will be $14. 8 * 1.75 = 14