Bond J is a 3 persent coupon bond. Bond K is a 9 percent coupon bond. Both bonds have 15 years to maturity, make semi-annual payments, and have a YTM of 6 percent. If interest rates suddenly rise by 2 percent, what is the percentage price change of these bonds? what if it suddenly fall by 2 percent instead? What does this problem tell you about the interest rate risk of lower coupon bonds?