Maths~

👨🏻‍🏫 學術台數學

[匿名]

2009-12-11 10:50 pm

我唔明個分數同個百分數點乘同條式係點計出來...
唔該~ 解釋同步驟,詳細d
1)After increasing a value by 2.5,the new value is 22.5.
2)After decreasing a value by 20,the new value is 60.

更新1:

Find the percentage 1),2) Find the new value 3),4) 3)Increase 100 g by6.5% 4)Decrease $150 by 10 %

回答 (1)

用戶2053

2009-12-12 12:48 am

✔ 最佳答案

1) the percentage change

= (new - old) / old * 100%

= [22.5 - (22.5 - 2.5)] / (22.5 - 2.5) * 100%

= 2.5 / 20 * 100%

= + 12.5%

method 2 :

(+2.5) / (22.5 - 2.5) * 100% =+ 12.5%

2) the % change

= (- 20) / (60 - 20) * 100%

= - 50 %

3) the new value :

100 * (1 + 6.5%)

= 100 * (1.065)

= 106.5 g

4) the new value :

150 * (1 - 10%)

= 150 * (1 - 0.1)

= $135

👍 0 👎 0

收錄日期: 2021-04-21 22:05:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091211000051KK00640

檢視 Wayback Machine 備份