The common stock for the Bestsold Corporation sells for $57. If a new issue is sold, the flotation costs are estimated to be 11 percent. The company pays 50 percent of its earnings in dividends, and a $4.00 dividend was recently paid. Earnings per share 3 years ago were $6.00. Earnings are expected to continue to grow at the same annual rate in the future as during the past 3 years. The firm's marginal tax rate is 34 percent.

Calculate the cost of (a ) internal common equity and (b ) external common equity.