8 (20 points). A company has $25 billion of sales and $1 billion of net income. Its total assets are $12 bil llion. The company's total assets equal total invested capital, and its capital consists of debt and common equity, 55% and 45%, respectively. The firm's interest rate is 8%, and its tax rate is 26%. a) What is its ROA? b) What is its ROE? c) What is its ROIC? d) Would this firm's ROA (increase or decrease) if it used more leverage, assuming that this size of the firm does not change? (Circle the right answer)