Bond J has a coupon rate of $3$ percent. Bond K has a coupon rate of $9$ percent. Both bonds have $18$ years to maturity, make semiannual 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 rates suddenly fall by $2$ percent instead? What does this problem tell you about the interest rate risk of lower$-$coupon bonds?