Bond J is a 3.8% coupon bond. Bond K is a 9.8% coupon bond. Both bonds have 15 years to maturity, make semiannual payments and have a YTM of 6.8%. (Do not round intermediate calculations. Negative answers should be indicated by a minus sign. Round the final answers to 2 decimal places.) If interest rates suddenly rise by 2%, what is the percentage price change of these bonds? What if rates suddenly fall by 2% instead?