(Cost of equity) The common stock for the Bestsold Corporation sells for $58. If a new issue is sold, the flotation costs are estimated to be 8 percent. The company pays 50 percent of its earnings in dividends, and a $4 dividend was recently paid. Earnings per share 5 years ago were $5. Earnings are expected to continue to grow at the same annual rate in the future as during the past 5 years. The firms marginal tax rate is 21 percent. Calculate the cost of (a) internal common equity and (b) external common equity.