A bank has the following balance sheet $($$M$)$ and no off$-$balance sheet activities

$M Liabilities & Equity $M

Cash $100$ Retail Deposits $1550$

Treasury securities $250$ Subordinated Debt $75$

Residential mortgages, category $1,55\%$ LTV $700$ Common Stock $65$

Residential mortgages, category $2,70\%$ LTV $300$ Retained Earnings $40$

Commercial Loans $400$ Noncumulative perpetual preferred stock $20$

Total Assets $1750$ Total Liabilities & Equity $1750$

a$.$ What is the CET$1$ risk$-$based ratio? c$.$ What is the total risk$-$based capital ratio?

b$.$ What is the Tier I risk$-$based capital ratio? d$.$ What is the leverage ratio?