A 8-year zero-coupon bond has a face value of $1,000. If its YTM changes from 4.0% to 4.5%, what is the resulting percentage change in its price? Use the price determined from the first yield, 4.0%, as the base in the percentage calculation. Round to the nearest hundredth of a percent. (e.g., 4.32% = 4.32). [Hint: If the price dropped, enter a negative number].