althougt the cost of electricity is increasr by 10% , the
total expenditure is decrease by 10%. find the % change in the amount
of the electricity used.
MATHS ABOUT %
2008-12-24 6:21 am
回答 (1)
2008-12-24 9:30 am
✔ 最佳答案
The answer is as follows:圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/20081224_mat_1.jpg?t=1230053372
收錄日期: 2021-04-23 23:07:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081223000051KK01989