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标题: 问一道prep数学题，谢谢大家啊 [打印本页]

作者: linglingdang 时间: 2009-7-17 07:16 标题: 问一道prep数学题，谢谢大家啊

刚模了一套Prep，有道数学没看懂……

Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that country whose annual income is I ?

答案是C, 50+I/40，怎么也不明白，拜托看懂的同志帮我解释一下题~感激ing~~

作者: 羽依依 时间: 2009-7-17 22:11

2% * I + (100+ 1% * I)/2 =50+ 4/200 * I= 50 +I/50

作者: linglingdang 时间: 2009-7-18 09:53

可是答案是 50+ I/40 啊……

作者: 羽依依 时间: 2009-7-20 06:49

2% * I + (100+ 1% * I)/2 =50+ 5/200 * I= 50+ I/40

不好意思最后一部写错了

作者: linglingdang 时间: 2009-7-20 21:09

终于明白了~~非常感谢！！

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