买了一个固定资产，花了600万，能使用六年，如果用加速折旧法的话，第一年减200万，第二年为什么是减少180万，第三年减少150万，第四年减少70万，不明白是怎么计算的

請問原版書 Reading 20 課後題 Q24. 中解答 C is correct. Winslow’s Statement VI is incorrect. Due to covered interest arbitrage, the relative attractiveness of bonds does not depend on the currency into which they are hedged for comparison. Hence, the ranking of bonds does not depend on the base currency of the portfolio. A is incorrect because Winslow’s Statement IV is correct. Inter-market trades should be assessed on the basis of returns hedged into a common currency. Doing so ensures that they are comparable. Neither local currency returns nor unhedged returns are comparable across markets because they involve different currency exposures/risks. 當投資外國債券的時候，currency return 應該也要考慮進去吧? 請問為什麼statement VI 是錯的但是 statement IV 是對的?

請問可以解釋原版書 Reading 20 課後題 Q23. C 選項這段話嗎? "Inter-market carry trades do not, in general, break even if each yield curve goes to its forward rates. Intra-market trades will break even if the curve goes to the forward rates because, by construction of the forward rates, all points on the curve will earn the “first-period” rate (that is, the rate for the holding period being considered). Inter-market trades need not break even unless the “first-period” rate is the same in the two markets. If the currency exposure is not hedged, then breaking even also requires that there be no change in the currency exchange rate."

請問原版書 Reading 20 中課後 Q20: Based on Exhibits 1 and 2, which of the following portfolios is most likely to have the best performance given Edgarton’s yield curve expectations? A steepening yield curve 不是應該選bullet? 根據Exhibit 2. Selected Partial Durations 的表中可以知道 current portfolio and pro forma portfolio 2 是 barbell portfolio. 所以答案為什麼不是選 B 選項?

老师 请问条款用在哪些方面

老师你好，reading 14 课后题第3题，我选的是B选项，即按照increase 最大的expected excess return，decrease最小的expected excess return。 正确答案不是A的原因是因为investment grade bonds是15%，已经低于20%的target，所以他不能再低了是么？ 那A选项要increase developed market equity，这个资产的比重已经是30%了，和target一样，再增加肯定超出target ，没有问题么？

你好，2019原版书课后题，第183，184页第6题，我记得老师说即使给了税率，二级这里债务成本这里也不要扣点税，而这个答案是按照一级，乘以（1-0.3）了，

老师你好。原版书Reading 35中第5题，债券应评级变化导致的收益率变化，债券价格变化的数字是从哪里得来的？

老师这道例题算ROE的时候，equity不应该是取平均值吗，也就是说，不应该是只能对2016和2017的ROE进行计算和杜邦分析吗？

老师，我怎么判断Covered call新图像的拐点（绿色的点）在哪里呢？（和short call的拐点重叠/上面/下面）