推 chenemily:謝謝 09/10 08:31
※ 引述《chenemily (天天保持好心情)》之銘言：
: A merchant discounted the sale price of a coat and the sale price of a
: sweater. Which of the two articles of clothing was discounted by the greater
: dollar amount?
: (1) The percent discount on the coat was 2 percentage points greater than the
: percent discount on the sweater.
: (2) Before the discounts, the sale price of the coat was $10 less than the
: sale price of
: the sweater.
: 請問這題我可以刪掉A B D
: 如果合再一起想 該怎麼想 是要代數字嗎?
: 答案是E
: 謝
看完題目的想法:
base高*折扣%高=折扣amount高
base低*折扣%低=折扣amount低
但
base高*折扣%低=>無法確定...
這因為題目給的(2)條件無法看出明顯比例關係
(考乘法的我會先這樣想)
主要還是看兩個base間的相對比例關係
代兩組數字看看...
我就假設折扣C=50%, S=48%
價格C=10, S=20(base相比差很大, 1:2)
那折扣amount:
C=10*50%=5
S=20*48%=9.6 > C
換代價格C=10000, S=10010 (base相比幾乎1:1)
C=10000*50%=5000
S=10010*48%=4804.8 < C
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