Problem:
A 10 year bond has semi-annual coupons. The coupon rate is 5% for the first 5 years and 9% for the following 5 years. The bond has face amount of 100 and a redemption amount of 105. Six months before the first coupon, the bond is purchased for 100.
Requirement:
Question: Calculate the nominal annual yield rate compounded semiannually.
Note: Provide support for rationale.