Eastern Electric currently pays a dividend of about $1.89 per share and sells for $30 a share. a. If investors believe the growth rate of dividends is 3% per year, what is the opportunity cost of capital? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Cost of Capital b. If investors' opportunity cost of capital is 12%, what must be the growth rate they expect of the firm? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Growth rate D % c. If the sustainable growth rate is 2% and the plowback ratio is .4, what must be the return on equity ROE? (Round your answer to 2 decimal places.) ROE L %