MATHS HELP!
2008-03-19 3:37 am
1. The selling price of a car is decreased by 20% each year. Suppose the selling price of a car is $25000 in 2006, what is the selling price of the car in 2005?
回答 (2)
2008-03-19 4:02 am
✔ 最佳答案
let the selling price of the car in 2005 be XX(1-20%)= 25000
X=25000(100/80)
X=31250
驗算: 31250*(1-20%)
=25000
2008-03-19 3:42 am
let x be the selling price of the car in 2005
x(1-20%)=25000
x=31250
x(1-20%)=25000
x=31250
收錄日期: 2021-04-14 20:31:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080318000051KK02572