Bond J has a coupon rate of $7$ percent and Bond K has a coupon rate of $13$ percent. Both bonds have $16$ years to maturity, make semiannual payments, and have a YTM of $10$ percent.

a$.$

If interest rates suddenly rise by $2$ percent, what is the percentage price change of these bonds? $($A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What if rates suddenly fall by $2$ percent instead? $($Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$