Bond J is a 3.5% coupon bond. Bond K is a 9.5% coupon bond. Both bonds have 15 years to maturity, make semiannual payments and have a YTM of 6.5%. (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?

How to solve these problems with BA calculator?