B哪里不对了？

During 2009, the following events occurred at a company. The company: 1. Purchased a key customers management service for $120,000, which is expected to provide equal annual benefits for the next 4 years. 2. Recorded $200,000 of goodwill in the acquisition of a subsidiary. It is estimated that the acquisition would provide substantial benefits for the company for at least the next 10 years. 3. Raise a donation in products and services to the community. The donation enhanced the company's reputation substantially and would likely be worth at least $100,000 annually over the next 5 years. Based on these events, the amortization expense that the company should report in 2010 is closest to: 老师您好，这个题没有视频解析，麻烦给我解答下详细的分析计算过程

你好，老师 关于公式后面，因为欠税务局的多了，现在交的少了，就+△DTL；相反，就是-△DTA。是怎么解释的呢？这块没有理解。 谢谢~

老师好，图中彩色标记的两个切点代表的意义什么？有什么区别？谢谢！

risk-free arbitrage profit的公式到底是啥，如何判断正负，老师没讲，视频里，一头雾水

老师，base currency has appreciated by 9% against the price currency，不应该是X/1.09=1.4600？

老师，问个傻傻的问题，dollarization不是在arrangements with no seperate legal tender的子条目出现的么，老师讲的是没有独立货币，可以认为冰岛因为用欧元作为货币，没有独立货币，才可以实行货币局制度么？就是dollarization一定是没有本国货币的国家么，比如欧盟国家。不知道您能不能理解我的意思。

老师，答案不应该是CNY/GBP吗

这题答案是不是有问题啊，应该选A，国有企业

PPT上第一道题t=0,1,2那个，10000的持有期不应该是两年吗，也就是说t=2的时候不应该是两笔金额吗