18. Last year a company achieved a rate of return on equity of 9 percent, its debt-to-equity was equal to 3 and the average interest rate that it paid was 6 percent. a) What was this firm's return on assets? Given the information you have, should it reduce its liabilities? Explain. b) Net income was equal to 270,000 and fixed assets were equal to two thirds of total assets. Current liabilities were equal to 3 million. What was this firm's net working capital