prep的数学题

Dukeling

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
题目看不懂，恳请NN们赐教。。。

myice

这个题目以前是有人问的 似乎是guomei
算起来 她应该明天考试
先预祝她能考出一个好成绩：）

在化简之前，R国计算收入税的介绍为： 将 某人年收入的2% 和 100个R货币单位与该人年收入的1%的平均数（算数平均数）相加

所以就是 2/100*I+ （100+ 1/100*I）/2 = 50 + 3I/100
B应该是正确答案

这道题真正要读的时候要学会正确的断句：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

这句话断句是这样的：

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}

add X to average of Y and Z 就是X + (Y+Z)/2
其中
X = 2 percent of one’s annual income = I/50
Y = 100 units of Country R’s currency = 100
Z = 1 percent of one’s annual income = I/100

带入计算就好了

参考本贴：http://www.beyondgmat.cn/index.php/bbs?func=view&catid=8&id=1655#1668

引自www.beyondgmat.cn