4. A 5-year bond (denote this as Bond A) with semiannual coupons has a face value of $1,000 and a coupon rate of 6%. The bond is redeemable at 125% of the face value at maturity, and is currently selling for $1,015. Assume the next coupon is due six months from now. (a) Using linear interpolation with end points being 9% and 10%, approximate the bond's effective annual yield. (b) Another 5-year bond (denote this as Bond B) pays annual coupons and has the same face value, coupon rate, redemption value and yield as Bond A. Which bond has a larger duration? Explain your