Suppose you purchased a $20-$year U$.$S$.$ treasury bond with a $6\%$ annual coupon ten years ago at par,

but coupon payments are made semi$-$annually.

Today the bond's yield to maturity has risen to $8\%$

a$.$ If you hold the bond until maturity, what is the yield that you will earn on your investment?

b$.$ If you sell the bond now, what will be the price at which you sell the bond?

c$.$ If you sell the bond now, what annual return $($yield$)$ that you have made on this bond?