1.明輝以1000元購入一部mp3機，一星期後以原價的95%賣給哥哥。問轉讓價比原價便宜了多少元？
2.兩間商店以相同價錢出售相同品牌的罐裝巧克力。今天，A商店和B商店同時決定調整該罐裝巧克力的售價。A商店先降價30%，一個星期後又漲價30%；而B商店則先降價40%，一星期後又漲價40%。試比較一星期後該罐裝巧克力在兩間商店的售價是否相同？
中一數學（百分法）2題
2007-08-01 1:59 am
回答 (4)
2007-08-01 2:04 am
✔ 最佳答案
1. 讓價= 1000 x 95%
= $950
所以，讓價比原價便宜了
= 1000 - 950
= 50 元
2. 設$x為朱古力原本的價錢
A店：
新售價, x' = (1 - 30%)(1 + 30%)x = 0.7 x 1.3 x = 0.91 x
B店：
新售價, x" = (1 - 40%)(1 + 40%)x = 1.4 x 0.6 x = 0.84 x
所以，兩個新的售價並不同。
而，B店朱古力的新售價比A店的便宜。
參考: Myself~~~
2007-08-02 1:54 am
1) $50
2) 不相同
2) 不相同
2007-08-01 2:14 am
1) 1000-(1000x95%)
=1000-950
=50($)
2) for e.g the candy is $10
a shop: 10x(1-30%)x(1+30%)
=10x0.7x1.3
=7x1.3
=9.1
b shop: 10x(1-40%)x(1+40%)
=10x0.6x1.4
=6x1.4
=8.4
no, they a not selling for same prise, but b shop is cheaper.
=1000-950
=50($)
2) for e.g the candy is $10
a shop: 10x(1-30%)x(1+30%)
=10x0.7x1.3
=7x1.3
=9.1
b shop: 10x(1-40%)x(1+40%)
=10x0.6x1.4
=6x1.4
=8.4
no, they a not selling for same prise, but b shop is cheaper.
參考: me
2007-08-01 2:06 am
1)
轉讓價 = $1000*95% = $950
便宜了 = $1000 - $950 = $50
2)
let x be the cost
A商店 = ((x*(1-30%))*(1+30%) = 0.91x
B商店 = ((x*(1-40%))*(1+40%) = 0.84x
so, the cost will not be same afer 1 week.
轉讓價 = $1000*95% = $950
便宜了 = $1000 - $950 = $50
2)
let x be the cost
A商店 = ((x*(1-30%))*(1+30%) = 0.91x
B商店 = ((x*(1-40%))*(1+40%) = 0.84x
so, the cost will not be same afer 1 week.
收錄日期: 2021-05-03 06:54:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070731000051KK03999