consider a $20-$year bond paying $8\mathrm{.}5\%($semi$-$annually$)$ and selling for US$$850\mathrm{.}42$ per US$$1,000$ par value. This bond is callable in $5$ years at US$$1,025.$ Find, by using either Goal Seek or the IRR function, the semiannual yield$-$to$-$call $($YTC$),$ the annual YTC and the effective yield.