數學題（折扣）

1. 折扣百分率=1-7/8 = 1/8 x 100% = 12.5%
2. 實際折扣百分率 :
{1-0.95x0.95}x100% = 9.75%

1.折扣百分率:1/8X100%=12.5%
2.折扣百分率:設x做現金付款的實際折扣百分率:
1-x乘(1-5%)乘(1-5%)=9.75%
現金付款的實際折扣百分率=9.75% ^^

1.某蛋糕店大減價，所有蛋糕一律買七送一，求折扣百分率。
2.某商店大減價，全店貨品以5%的折扣百分率出售。若以現金付款，更可獲額外5%的折扣百分率。求以現金付款的實際折扣百分率。

1.應該是這樣..
1
－ｘ100%=12.5%
8

2.設該貨品為n元

第一次折= n X 0.95 =(0.95n)

現金折=0.95n X 0.95 =(0.9025n)


百份變化= n-(0.9025n)
－－－－　ｘ１００％
n


n(1-0.9025)
=－－－－－ｘ１００％ （將n 約去)
n


=(1- 0.9025) x100%

=9.75%

所以百分變化是+35%

1. assume one piece of cake cost $x
discount % = (x/8x)*100% = 12.5%

2. assumeprice of a product is $x
then the money you need to pay is x*0.95*0.95=0.9025x
discount % = [(1-0.9025)x] / x *100% = 9.75%