(3) 金融機構執行此利率交換獲得的好處為何？(單位bps)(3分)

8. A bond's rating provides a guide to its price. As we write this in 2009, Aaa bonds yield $5.45\%$ and Baa bonds yield $8.67\%$. If some bad news causes a $10\%$ five year bond to be unexpectedly downrated from Aaa to Baa, what would be the effect on the bond price? (Assure annual coupons with face value $1,000) (10分)