Four years ago you bought a $25-$year $8\mathrm{.}5\%$$$1,000$ bond. The bond pays

interest each $6$ months. You want to sell the bond. You just received

the $8^{th}$ semiannual interest payment of periodic

rate $=$$$42\mathrm{.}50$ Similar bonds are being issued that pay $6\%$

semiannually. What is your bond worth today?