折扣(40分)

( 395 - 209 ) / 395 X 100 % OFF

186 / 395 X 100 % OFF

0.47 X 100 % OFF

47$ OFF = 53 拆


( 44 - 36.9 ) / 44 X 100% OFF

7.1 / 44 X 100 % OFF

0.16 X 100 % OFF

16 % OFF = 84拆

1.(209over395)乘100%
=52又79分之72%
小數後兩位﹕52.91%，大約為五三折。
2.(36.9over44)乘100%
=83又22分之19%
小數後兩位﹕83.86%，大約為八四折。

(1) 原價:$395 NOW:209 求折扣
(209/395) * 100%=52.9%

(2) 原價:$44 NOW:36.9 求折扣
(36.9/44) * 100%=83.86%

(1) First: Calculate Cash Discount = $395 - $209 = $186
Second: Divide Cash Discount to 原價 = $186 / $395 = 0.471 = 47.1% off the 原價
Third: 1 - 0.471 = 0.529 = 52.9% of the 原價

In summary: the equation (列式) is 1-((395-209)/395)=0.529 -> 0.529x100% = 52.9%

(2) First: Calculate Cash Discount = $44 - $36.9 = $7.1
Second: Divide Cash Discount to 原價 = $7.1 / $44 = 0.161 = 16.1% off the 原價
Third: 1 - 0.161 = 0.839 = 83.9% of the 原價

In summary: the equation (列式) is 1-((44-36.9)/44)=0.839 -> 0.839x100% = 83.9%

(1) $209/$395 = 0.52911 = 52.911%

(2) $36.90/$44.00 = 0.838636 = 83.8636%

兩個的折扣均不是完整的百分比，只可以四捨五入取近似值
(1)的折扣是大約五二折，英文為47.099%off
(2)的折扣大約為八三折，英文為16.1364%off

1) (395-209)/395=186/395=est.47.08%
2) (44-36.9)/44=7.1/44=16.136363....%

(1)
(209/395) * 100%
=52.9%

(2)
(36.9/44) * 100%
=83.86%

(1-209/395)x100%=47.088608%

(1-36.9/44)x100%=16.136364%

2007-05-12 01:38:29 補充：
the discount percentage is an english version, i.e. 47.088608% off.中文應寫成五三折或五折三扣