1) The document discusses the cost of retained earnings and cost of common stock. It defines retained earnings as the portion of earnings left after paying dividends that is available for reinvestment. 2) For determining the cost of retained earnings, the document provides formulas both with and without flotation costs. It notes that the cost of retained earnings is typically considered equal to the cost of equity. 3) The cost of new common stock, also called the cost of external equity, is the cost of retained earnings increased by flotation costs associated with issuing new shares. An example calculation is provided.