17. Zero Corp's total common equity at the end of last year was $405,000 and its net income was $80,000. What was its ROE? 18. River Corp's total assets at the end of last year were $415,000 and its net income was $32,750. What was its return on total assets? 19. The Norfolk Fish Company is a chain of seafood restaurants. Its profit margin for 2010 is 8% (0.08); its total assets turnover ratio is 1.0; and its equity multiplier is 1.5. What is its return on common equity (ROE) based on the Dupont equation? 20. For 2018, Electro Tech Inc. has reported earnings before interest and taxes (ebit of $6.5 million; capital expenditures of $1.5 million; and depreciation of $0.7 million. Net working capital for 2018 is $1.0 million and for 2017 is $0.5 million. The tax rate for Electro Tech is 35%. Calculate Electro Tech's free cash flow. (Show your work.)