请问D选项怎么理解，为什么错了

Dear 老师， 请问为什么 妻子回信丈夫的概率也是2/3啊 妻子回复是百分之百 下面的分布图上 在妻子收到丈夫信的情况下 妻子回信概率是2/3

A bank issues a 6-month, USD 1 million CD at 4% and funds a loan in ARS at 6.5%. The spot rate for ARS was ARS2.27 per USD at the time of transaction. In 6 months, the ARS depreciated to ARS 2.3 per USD. What is the realized nominal annual spread on the loan? B. -0.19% 请老师解释下这题，谢谢！

A bank has a USD 50 million portfolio for investment. The cost of funds for that is 4.5%. The bank lends 50% of the assets to domestic customers at an average loan rate of 6.25%. The rest is lent to UK client at 7%. The current exchange rate is USD1.642/GBP. At the same time, the bank sells a forward contract equal to the expected receipts one year from now. The forward rate is USD1.58/GBP. The weighted average return to the bank on its assets is closest to : D. 4.61% A bank borrows USD 5 million at 4.5%, purchase euros on the spot market, and lends that amount to a German firm at 6%. The euro spot rate is EUR1.12/USD. After one year, the exchange rate is EUR0.84/USD. The rate of return of this loan to the bank is closest to : C.36.8% 老师这类利率总是很绕，有什么简便一点的方法吗？

老师 请问 答案中more less表示什么意思呢

这里公司约定了卖出价，那应该是价格上涨受损，担心价格上涨用long hedge啊，怎么是short hedeg？

这道题为什么要买36份合约?

为什么这道题的答案里，算组合久期时，直接用麦考林久期的加权平均？不应该是用修正久期的加权平均吗？

这里为什莫要乘对冲比率?1 .14.2题为什么不直接用dvo1s/dvo1f

请问为什么分母不是不用乘以P0？