When the cost of petrol is raised by 25%, a driver reduces his consumption by 20%,
what is the percentage change in his monthy expediture on petrol?
F.3 Maths 1題
2010-01-24 7:25 am
回答 (1)
2010-01-24 7:36 am
✔ 最佳答案
let x be the original cost of petroly be the original consumption of petrol
Original expenditure : xy
New expenditure: (1.25x)(0.8y) = xy
Percentage change = (xy - xy)/xy * 100 % = 0%
參考: myself
收錄日期: 2021-04-21 14:58:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100123000051KK01839