If a stock decreases in one period and then increases by an equal dollar amount in the next period, will the respective arithmetic average of the continuously compounded and holding period rates of return be positive, negative, or zero? A Zero; zero. B Positive; zero. C Zero; positive. 这题什么原理？

If the price of a stock goes from $15.00 to $16.20 in one year, the continuously compounded rate of return is closest to: A 8.33%. B 7.70%. C 8.00%.、 这题答案没错？？？？

为什么这里可以选择excellent records

无法理解4000deposit增加

为什么不选B

没有duration也能计算吗？

Which of the following statements regarding the covariance of rates of return is least accurate? A If the covariance is negative, the rates of return on two investments will always move in different directions relative to their means. B It is a measure of the degree to which two variables move together over time. C It is not a very useful measure of the strength of the relationship, there is absent information about the volatility of the two variables. 这题a是对的呀，题干问不对的

American call 1的S>X，可以行权了；American call 2，70<65，没有行权为什么还有positive的time value。

A为什么错

这题的解释没看明白