Luther Industries needs to raise $$25$ million to fund a new office complex. The company plans on issuing ten$-$year bonds with a face value of $$1,000$ and a coupon rate of $6\mathrm{.}8\%($annual payments$).$ The following table summarizes the YTM for similar ten$-$year corporate bonds of various credit ratings:

$\backslash$table$[[$Rating$,$AAA,AA$,$A$,$BBB$,$BB$],[$YTM$,6\mathrm{.}71\%,6\mathrm{.}91\%,7\mathrm{.}01\%,7\mathrm{.}41\%,7\mathrm{.}91\%$