老师，590题C选项是什么意思，为什么C是对的？

请问，为什么题目算债券B价值用e折现？我用计算器算pv是否可以？

老师您好.45题这个duration怎么知道是MD还是Mac.D?

请问这题的C选项 债券为什么不能以超过面值的价格发行呢？也是存在溢价发行的呀？

老师请问为什么在正常情况下石油与天然气的期货价格小于现货价格

Sortino ratio calculation: MAR is pre-setted, not the kind of mean of sampl, MAR WILL NOT alter the degree of freedom, why the denominator has the way to get the deviation as the samplling deviation computation? The function should be wrong, IF no return is below the MAR, whta is meaning of the function? sum o to o, makes no sense to the function. so, T sould be sums from 1, not zero, to a certain count. thanks!

Sortino ratio calculation: MAR is pre-setted, not the kind of mean of sampl, MAR WILL NOT alter the degree of freedom, why the denominator has the way to get the deviation as the samplling deviation computation?

请问为什么floater的duration是0？

老师，为什么这里面的r=0.1，不是0.2。就是这句话不是说6个月远期收益为2%吗？而且不是应该是0.039-q吗？收益不是0.2吗？不是相当于q=0.2吗？为什么是r？希望老师能讲一下这个题，谢谢了。

为什么分母的指数是0.25*2？不是90/360吗