问题如下：
Based on Exhibit 3, if Bond IV’s credit rating changes during the next year to an A rating, its expected price change would be closest to:
选项：
A. –8.00%.
B. –7.35%.
C. –3.15%.
解释：
C is correct. The expected percentage price change is the product of the negative of the modified duration and the difference between the credit spread in the new rating and the old rating:
Expected percentage price change = –4.2 × (0.0175 – 0.01) = –0.0315, or –3.15%.
这道题为什么不乘以百分之八的概率呢？谢谢老师
