I have a question about CDO's from asset backed securities$.$ Below i will provide context to my question with picture. I have no idea how i can calculate losses in different tranches. Below is an example of a mezzanine CDO, how would i go about calculation losses in the tranches?

Assets Are divided between $->$ senior tranche AAA $(80\%),$ Mezzanine tranche BBB$(15\%),$ Equity tranche not rated $(5\%).$

Then this BBB mezzanine tranche is divided into: senior tranche AAA $(65\%),$ mezzanine tranche BBB $(25\%),$ and an equity tranche $(10\%).$

the picture i added has the answers, Thanks in advance!

Losses to AAA Tranche of ABS CDO

$($Table $8\mathrm{.}1,$ page $193)$

$\backslash$table$[[\backslash$table$[[$Losses on$],[$Subprime$],[$portfolios$]],\backslash$table$[[$Losses on$],[$Mezzanine$],[$Tranche of$],[$ABS$],[(15)$hanks in advance!