贷款30万元，贷款利率为6%，期限20年，按月本利平均摊还，第180期到第200期应该偿还的本金与利息各为（）。（答案取最接近值。）
A．9557元和33428元
B．33428元和9557元
C．10129元和35000元
D．35000元和10129元
参考答案：D
解析：
6 g i，20 g n，30PV，0FV，PMT=-0.2149万元；
179 f AMORT，21 f AMORT-1.0129万元，x＞＜y-3.5万元。
此期间还利息总额为10129元，此期间还本金总额为35000元。
使用金拐棍软件操作步骤如下：
Sarah wrote a letter to Annie, saying that she felt __31__ by her friend, Hannah. They had an exam recently and Sarah got the __32___ grade in the class. When washing hands with Hannah, Sarah __33__ that she did badly in the exam and __34__ her not to tell anyone else. However, the next day, some other students got to know the news. Sarah thought it was Hannah who didn’t keep her __35__ because the only people who can see their grades are the teacher and the students that the grades __36__ to. But when Sarah talked about it with Hannah, she __37__ that she hadn’t told anyone else and said that someone must have been __38__ on what they said. But Sarah didn’t __39 __ her, and could not __40__ her for doing that and lying. Sarah lost her best friend.
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