prep一道数学，大家帮我解一下

angelazhao1010 · 发表于 2010-8-18 14:19:20

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
答案是C题目怎么理解啊

angelazhao1010 · 发表于 2010-8-18 14:52:19

自己顶一下啊啊！

nicktian · 发表于 2010-8-18 15:02:59

the average of 说的是后面两个的平均就是（100+1%I）/2,再加上2%I就是C了

ivy87jxj · 发表于 2010-8-18 15:19:34

楼上正解，

rectina1011 · 发表于 2010-8-18 18:44:13

感谢解惑~！

angelazhao1010 · 发表于 2010-8-20 16:45:32

谢谢NN！哈哈！

prep一道数学，大家帮我解一下

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