Dot-com companies are often valued by applying the （） ratio.

单项选择题A stock has a required rate of return of 15%, a constant growth rate of 10%, and a dividend payout ratio of 45%. The stock's price-earnings ratio should be:（）

A. 3.0 times.
B. 9.0 times.
C. 4.5 times.

单项选择题The risk-free rate is 5 percent, the market rate is 12 percent, and the beta of a stock is 0.5, what would happen to the required rate of return if the inflation premium increased by 2 percent It would:（）

A. increase to 15.
B. decrease to 8.5.
C. increase to 10.5.