Assume you are given the following relationships for the Rainboldt Corporation: Sales/Total assets Return on assets (ROA) Return on equity (ROE) 2.5x 5.25% 7.50% Calculate Rainboldt's debt-to-capital ratio, assuming it uses only debt and common equity financing. O a. 42.86% O b. 30.00% O c. 142.86% O d. 51.11% O e. 70.00% k