help i need the step by step

A bank has $235 million in assets in the 0 percent risk-weight category. It has $246 million in assets in the 20 percent risk-weight category. It has $117 million in assets in the 50 percent risk-weight category and has $54 million in assets in the 100 percent risk-weight category. This bank has $17 million in Tier 1 capital and $43 million in Tier 2 capital. What is this bank's ratio of Tier 1 capital to total assets