P.6數學(賺賠)急

2007-11-01 12:58 am

賣出2本書共1.8元，賺率12.5%賺得多少?

過程

thx~

回答 (5)

2007-11-01 1:44 am

$1.8 / (1+12.5%) x 12.5%
= $1.8 / 1.125 x 12.5%
= $1.6 x 12.5%
= $0.2
每本書賺$0.1
賺得$0.2元!

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2007-11-01 1:15 am

先計本金是多少
切x是本金

[x*(1+12.5%)]*2 = 1.8
x*112.5%=1.8/2
x*(1125/1000)=0.9
x=0.9*(1000/1125)
x=0.8

2本書的本金是 0.8*2 = 1.6
賣出兩本書共賺 1.8-1.6= 0.2
賺得0.2元!

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2007-11-01 1:12 am

$1.8 / (1+12.5%) x 12.5%
= $1.8 / 1.125 x 12.5%
= $1.6 x 12.5%
= $0.2
共賺$0.2
每本書賺$0.1

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2007-11-01 1:07 am

1.8/2=0.9=1本書
0.9/(1+12.5%)
=0.9 x 8/9
=0.1
=賺0.1元

2007-10-31 17:08:20 補充：
2本書賺$0.2

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2007-11-01 1:04 am

1.8x 12.5%
=1.8 x 125/1000
=$0.225
唔係太肯定,,好耐無計lu~

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