ABCInc., and DEF Inc. both have 10 percent coupon bonds outstanding, with annual interest payments, and both are priced at par value. The ABC Inc., bond has 2 years to maturity, whereas the DEF Corp. bond has 20 years to maturity. If interest rates suddenly rise by 1 percent, what is the percentage change in the price of these bonds? If interest rates were to suddenly fall by 1 percent instead, what would the percentage change in the price of these bonds be then? What does this problem tell you about the interest rate risk of longer-term bonds?