National Bank has the following balance sheet (in millions) with the risk weights in parentheses and has no off-balance-sheet activities. 45 Assets Cash (0%) Treasury bills (0%) Residential mortgages [category 1; loan-to-value ratio = 70%] (50%) Business loans (100%) Total assets Liabilities and Equity $20 Deposits $980 Subordinated debentures (Tier II) 25 Common stock (CET1) Retained earnings (CET1) 40 600 Total liabilities and equity $1,090 430 $1,090 a. What is the CET1 risk-based ratio? b. What is the Tier I risk-based capital ratio? c. What is the total risk-based capital ratio? d. What is the leverage ratio? e. In what capital risk category would the bank be placed