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标题: 请帮我看看这个“巨难”的数学题吧 [打印本页]

作者: zhipei 时间: 2010-10-28 11:44
标题: 请帮我看看这个“巨难”的数学题吧
不好意思，标题党了。哎在我看来真是难挨，看都看不懂！这是我在今天做prep莫考的时候碰见的：

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 ?

A. 50+I/200
B. 50+3I/100
C. 50+I/40
D. 100+I/50
E. 100+3I/100

作者: chinamerica 时间: 2010-10-28 11:52
这个要念对题目
Country R 的income tax 是这么算的： (年收入的2％) + (100 和年收入的1％的算术平均直)
原文说 add (年收入的2％) to (100 和年收入的1％的算术平均直)
年收入是I, 那么税是 2％* I + (100+1%*I)/2 = 50+I/40

作者: 2010 时间: 2010-10-28 11:55
JUST "2 percent of one's annual income " + "the average (arithmetic mean)"

the average : ( [100 units of Country R's currency ]+[ 1 percent of one's annual income])/2

1% of income
which shall be I/100

now average will be

(100 + I/100) / 2

50 + I/200

Now the result will be

I/50 + 50 + I/200
=50 + 5I/200
=50 + I/40

作者: zhipei 时间: 2010-10-28 11:58

这个要念对题目
Country R 的income tax 是这么算的： (年收入的2％) + (100 和年收入的1％的算术平均直)
原文说 add (年收入的2％) to (100 和年收入的1％的算术平均直)
年收入是I, 那么税是 2％* I + (100+1%*I)/2 = 50+I/40

-- by 会员 chinamerica (2010/10/28 11:52:43)

多谢牛牛指教！看来还是理解太差。谢谢，想了一下午了都。。。。

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