1.若以$31680售出一輛電單車，其虧蝕百分率是12%。若以$29520售出該電單車，求新的虧蝕百分率。
2.施雅以$320購入一個書架。若該書架是以20%的折扣百分率出售，求書架我標價。
3.圖：http://img178.imageshack.us/img178/2230/92011657nj3.gif
已知雪欣到該店買了四張標價分別為＄60、＄74、＄76和＄90的鐳射唱片，
(a)求該項交易的整體折扣百分率。
(b)除了以上折扣優惠外，該影音店同時提供買四送一優惠。凡購買五張鐳射唱片，標價最低的一張可獲免費。如果雪欣多買一張標價＄80的鐳射唱片，求該項交易的整體折扣百分率。
中一數學問題（3題）
2007-05-31 1:29 am
回答 (3)
2007-05-31 1:33 am
✔ 最佳答案
1.好易先將31680除(1-12%)
就即係36000
之後將36000-29520再除36000乘100%
結果係18%
式:
31680/(1-12%)-29520
----------------------------x100%
~~~~~~36000
=18%
2.easy,先將售價(selling price)除番去個折扣率咪得la
答案是400
式:
320/(1-20%)
=400
3a.先group類
60為9折區
74及76為8折區
90為7折區
將他們乘相對的%
再相減乘100%
答案79%
式:
[60x90%+(74+76)x80%+90x70%]/(60+74+76+90)x100%
=[(54+120+63)]/300x100%
=237/300x100%
=0.79x100%
=79%
b.60 74 76 80 90 中60最平,所以不算60
又group類
冇cd係9折
74 76 80是8折
90是7折
同a方法一樣,不過總數要加60
式:
[(74+76+80)x80%+90x70%]/(60+74+76+80+90)x100%
=(184+63)/380x100%
=247/380x100%
=0.65x100%
=65%
ps:計到我死!請選我!
2007-05-31 2:04 am
1.Let$x be the oringinal price of the motorcar
(1-12%)x=31680
88%x=31680
88/100(100/88)X=31680(100/88)
X=36000
SO The original price of the motorcar is $36000
The new loss price
=$(36000-29520)/$36000X100%
=$6400/$36000X100%
=0.18X100%
=18%
2.Let$x be the making price of the book shelf
20%x=320
20/100(100/20)x=320(100/20)
x=1600
so the making price of the book shelf is $1600
第三題冇圖片唔知點做
(1-12%)x=31680
88%x=31680
88/100(100/88)X=31680(100/88)
X=36000
SO The original price of the motorcar is $36000
The new loss price
=$(36000-29520)/$36000X100%
=$6400/$36000X100%
=0.18X100%
=18%
2.Let$x be the making price of the book shelf
20%x=320
20/100(100/20)x=320(100/20)
x=1600
so the making price of the book shelf is $1600
第三題冇圖片唔知點做
收錄日期: 2021-04-29 18:56:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070530000051KK02442