[原创]8月数学机经全总结（讨论稿，8.23，198题）

christinahong

AGREE!

christinahong

以下是引用atongmu在2003-8-23 17:15:00的发言：
184. a company increases its costs/labor charges from $50/hour to $60/hour and enhances its parts charges by 8%. a certain job requires 1.5 hours of labor charges and parts charges, and the parts charges before change were $125/hour. what percent will the total charges for this job increase?
  参考答案：1/8
  思路：
  能讲讲吗？谢谢。[1.5(60-50)+125*0.08]/(50*1.5+125)
分母有误
我的做法：[1.5*(60+125*1.08)-1.5*(50+125)]/[1.5*(50+125)]=11.4%

[此贴子已经被作者于2003-8-23 17:21:31编辑过]

christinahong

以下是引用joywzy在2003-8-23 17:34:00的发言：
T166，A，只能=15。

A=35

christinahong

以下是引用christinahong在2003-8-24 23:03:00的发言：
24/25

是2/3，谢谢！

christinahong

181. 某城市人口中在职的为64%，48%是男性在职，问在所有在职职工中女性占多少？
参考答案：（25%）
思路：
有答案为16%，不知道是否正确？

184. a company increases its costs/labor charges from $50/hour to $60/hour and enhances its parts charges by 8%. a certain job requires 1.5 hours of labor charges and parts charges, and the parts charges before change were $125/hour. what percent will the total charges for this job increase?
参考答案：
思路：[1.5*(60+125*1.08)-1.5*(50+125)]/[1.5*(50+125)]=11.4%
请指正！

atongmu

181.这个几经不是很清楚，我对应了以前的寂静，答案应该是16%

184.零件和人工小时数没有关系。