A bank has $100 million in assets in the 0 percent risk weight category, $200 million in assets in the 20 percent risk weight category, $500 million in assets in the 50 percent risk weight category and $750 million in assets in the 100 percent risk weight category. This bank has $57 million in core (Tier 1) capital. What is this bank's ratio of Tier 1 capital to risk-weighted assets