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標題:

Discount

發問:

A shopkeeper raised the marked price of a dress by 20%.It was originally marked at $500.he then sold it to a customer at a 20% discount.Find (a)the new marked price. (b)the new selling price. (c)the actual rate od discount. 幾得要寫式!!!! 更新: 我唔明(c)呀~可唔可以解釋下~please~

 

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最佳解答:

(a) 新標明價錢。 500*(1+20%) =500*120% =500* 1.2 =$600 解:因為佢話要把本來個價錢提升20%,所以就係要乘1~20% <所以這件禮服的新標明價錢是$600> (b) 新售價。 600*(1-20%) =600*80% =600* 0.8 =$480 解:因為要比20%折佢,所以要把新標明果個價錢減20% <所以這件禮服新的售價是$480> (c) 實際折扣率。 (500-480)/500*100% 20/500*100% 4/100*100%(約簡『分子同分母同時除5』) 4/1*1%(再約簡『分母同%同時除100』 =4% 解:折扣率姐係話平左既錢佔全部幾多個%咁解 所以就要搵果二十蚊佔五百蚊的幾多%,就要乘100% 因此最終結果就係 <所以這件禮服實際的折扣率為4%>

其他解答:

(a) 500*(1+20%) =$600 (b) 600*(1-20%) =$480 (c) (500-480)/500*100% =4%5FAD1C75A5AA61DA
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