算数-百分数

算数-百分数

flyfish 2015-11-7 笔记

百分数（percent）=部分（part）/总数（whole）

一
A salesperson’s commission is k percent of the selling price of a car. Which of the following represents the commission，in dollars，on 2 cars that sold for ＄14000 each？

k percent
=k％
=k/100
the commission= 2*14000*k/100=280k

二
If the value of a certain building increased from ＄1.6 million to ＄2.0 million，what was the percent increase in the value？

the percent increase= (2-1.6)/1.6

三
Which of the following is equivalent to 1/2 of 23 percent of 618？

c of b percent of a 这一表达的翻译次序是从后往前翻译，
也就是a的百分之b的c

618 * 23% * (1/2)

四
If the length of a rectangle is increased by 30％，and the width is decreased by 30％，what is the effect on the area of therectangle？

五
In a certain election，60 percent of those who voted were females. If 8000 males voted，what was the total number of people who voted in the election？
20000

六
If x＞0，then 2 percent of 5 percent of 3x equals what percent of x？

注意翻译次序从后往前翻译
c percent of b percent of a
a的百分之b的百分之c

最后

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