A CMBS with four separate tranches is issued, with tranche $1$ being the most senior, tranche $2$ the second most senior, etc. The underlying properties are worth a total of $$800$mil. The par value of the tranches is as follows:

$1.$ $$200$ mil $2.$ $$150$ mil $3.$ $$140$ mil $4.$ $$55$ mil

What is the credit support for tranche $2?$