A CMBS issuance is $$560,539,655,$ of which the AAA$-$rated senior tranches total $$389,575,000$ of the principal balance, the AAA rated subordinate class $($or A$-$S Class$)$ is $28,727,000,$ the AA rated tranche is $$15,415,000$ and the Single A rated tranche is $$30,830,000.$ The amount of the deal that is subordinate to $($also called the subordination level$)$ the Single A rated tranche is

$17\mathrm{.}13\%$

$82\mathrm{.}87\%$

$22\mathrm{.}63\%$

$30\mathrm{.}50\%$