Explanation

The Basel III leverage ratio is calculated as:

Leverage Ratio = Tier 1 Capital / Total Exposure

Where:

• Tier 1 Capital includes Common Equity Tier 1 (CET1) and Additional Tier 1 capital
• Total Exposure includes on-balance sheet assets, derivatives exposure, securities financing transactions exposure, and off-balance sheet items

Based on typical Basel III requirements and the options provided:

• 3.70% represents a reasonable estimate that would be above the minimum Basel III requirement of 3% but below more conservative levels
• The Basel III minimum leverage ratio requirement is 3%
• Many banks maintain leverage ratios between 3.5-5% to provide a buffer above regulatory minimums
• Option B (3.70%) falls within this typical range and represents a realistic estimate for a bank's current leverage ratio under Basel III

This ratio helps ensure that banks maintain adequate capital relative to their total exposures, providing a non-risk-based backstop to the risk-based capital requirements.