The company just paid dividend of $250 per Common share that is expected to grow at an annual rate of 2.8% for the foreseeable future, and the current price of HSG Common stock is $$0 per share. Additionally, HSG has 3.5\% cumulative Preferred stock, par value $75 per share, that is currently priced at $68 per share. Finally, HSG has debt outstanding with a yield to maturity of 7.20%. The company is in the 21% marginal tax bracket. a) Rounded to two decimal places as a percent, the cost of common equity for HSG is = b) Rounded to two decimal places as a percent, the cost of Preferred stock for HSG is = c) Rounded to two decimal places as a percent, the after-tax cost of debt for HSG is =