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标题: 求助PS:Monthly kilowater-hours [打印本页]

作者: sires_0    时间: 2009-8-14 16:32
标题: 求助PS:Monthly kilowater-hours

求助PS:

Monthly kilowater-hours

 

        500

     1,000

     1,500

     2,000

Present 

$24

$41

$57

$73

Proposed 

$26

$45

$62

$79

The table above shows present rates and proposed rates for electricity for residential customers. For wich of the monthly kilowatt-hours shown would the proposed rate be the greatest percent increase over the present rate?

a) 500

B) 1,000

C) 1,500

D) 2,000

正解A. 我对题目的意思有点不理解。这道题的是不是求:proposed rate比 present rate 增加最多的是哪个?我觉得的AB相等啊。

A)(26-24)/500=2/500

B)(45-41)/1000=2/500


作者: sires_0    时间: 2009-8-18 11:52

没有NN可以帮忙看看的吗


作者: 北极虾仁    时间: 2009-8-18 12:16
正解是A么?
作者: sires_0    时间: 2009-8-24 16:09
以下是引用北极虾仁在2009/8/18 12:16:00的发言:
正解是A么?






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