AMC 8 2005 Problem 2
AMC8 2005 年第 2 题
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Karl bought five folders from Pay-A-Lot at a cost of $2.50 each. Pay-A-Lot had a 20%-off sale the following day. How much could Karl have saved on the purchase by waiting a day?
Karl 从 Pay-A-Lot 买了五个文件夹，每个价格为 2.5 美元。Pay-A-Lot 第二天降价 20％。那么 Karl 如果等一天他本可以省下多少钱？
- A.$1.00
- B.$2.00
- C.$2.50
- D.$2.75
- E.$5.00
正确答案 · Correct Answer
C
解析 · Solution
Solution 1
Karl paid . 20 % of this cost that he saved is .
Each folder can also be 5/2 dollars, and 20% can be shown as . We can multiply . is also 50 cents or the amount of money that is saved after the 20% discount. So each folder is 2.50-0.5 = $2.Since Karl bought 5 folders all of the folders after the discount is (5)(2) = 10, and the money bought before the discount is (5)(2.50) = $12.50. To find the money Karl saves all we have to do is subtract 12.50 - 10 = 2.50. Thus the answer is $2.50.
Having a 20% off sale is equivalent to a "Buy 4 get 1 free" sale. Thus, he would have saved the price of 1 folder, which is $2.50. -JeffersonJ
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