Portfolio A earned an annual return of 15 percent with a standard deviation of 28 percent. If the mean return on Treasury bills ( T - bills) is 4 percent, the Sharpe ratio for the portfolio is :（）

单项选择题Use the results from the following survey of 500 firms to answer the question.（）

A．20.4%.
B．15.4%.
C．3.4%.

单项选择题In any given year, the chance of a good year is 40 percent, an average year is 35 percent, and the chance of a bad year is 25 percent. What is the probability of having two good years in a row（）

A. 16.00%.
B. 10.00%.
C. 8.75%.