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求助~prep 输血题

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楼主
发表于 2010-10-23 17:08:58 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
题目如下:
  Before being simplified, the instructions for computing income tax were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of the country's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax for a person whose annual income is I ?
     答案是50+I/40    我算的是100+3I/100      求指点~~~
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沙发
 楼主| 发表于 2010-10-23 17:16:13 | 只看该作者
先自己顶一下~~请求大家帮忙!!
板凳
发表于 2010-10-23 17:46:20 | 只看该作者
设income=x
2 percent of one's annual income  = 0.02x
average (arithmetic mean) of 100 units of the country's currency and 1 percent of one's annual income = (100+0.01x)/2

把前面两个加起来 = 0.02x + (100+0.01x)/2

simplify一下就是 x/40 + 50 啦
地板
 楼主| 发表于 2010-10-23 17:55:50 | 只看该作者
谢谢ls~~恍悟~~
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