Caillou Guiliano Incorporated recently reported the following information: (Sales )/(Total Assets) : 2.25 Return on Assets (ROA) : 4.5% Return on Equity (ROE) : 7.5% Assuming the firm uses only debt and common equity, so total assets equal total invested capital. Answer the following questions: What is Caillou Gulliano's debt-to-capital ratio? a) 20% b) 50% c) 40% d) 35% e) 25%