You learn that a Wal-Mart bond has a maturity of 20 yea this bond fall by 0.74%. Calculate the corresponding per method based on bond duration. rs and a duration of 12.8 years. Suppose that interest rates on centage change in the price of the bond using the approximation Give your answer in percent to one decimal place. if the price decreases, then include a minus sign if the price increases, do not include any sign. Do not type the % symbol