1. You have a large position in two bonds with similar credit risk. Bond A is priced at par yielding 6% with 20 years to maturity. Bond B has 20 years to maturity, coupon 6.5% and yield of 6%. Which bond contributes more to the risk of the portfolio?

2. Bond A is a 1-year zero-coupon bond priced at $96, bond B is a 2-year zero-coupon bond priced at $91, and bond C is a 3-year zero-coupon bond priced at $80. Bond D is a 3-year bond paying a coupon of %10. What is the modified duration of bond D?