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标题: 求教一道prep数学题请指点 [打印本页]

作者: mingzhu99 时间: 2010-3-20 10:19 标题: 求教一道prep数学题请指点

Before being simplified, the instructions fo computing income tax in Country R were to add 2 percent of one`s annual income to the average 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

这题的意思我完全不懂。。。。忘各位XDJM赐教~~~~

作者: jiuwang 时间: 2010-3-20 21:15

选B吗

作者: mingzhu99 时间: 2010-3-21 09:40

答案是C哦我没看懂题目

作者: ivychacha 时间: 2010-3-22 01:46

2 percent of one`s annual income to the average of 100 units of Country R`s currency and 1 percent of one`s annual income
=>add(2% x I) to average(100 + 1%xI)
=>0.02I + 1/2(100 + 0.01I)
=>50 + 0.25I
=>50+I/40
=>C

作者: jiuwang 时间: 2010-3-22 07:06

啊！！！知道我错在哪儿了！！average修饰的是100 units of Country R`s currency and 1 percent of one`s annual income 所以就是100块和收入1%的平均数，是（100+1%I）/2 然后再用这个加上2%I，结果是50+I/40

作者: mingzhu99 时间: 2010-3-23 21:05

恩~~知道啦~谢谢~~

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