AMC 8 1998 Problem 9
AMC8 1998 年第 9 题
百分比★★☆☆☆
For a sale, a store owner reduces the price of a $10 scarf by 20% . Later the price is lowered again, this time by one-half the reduced price. The price is now
为了促销，一家商店的老板将一条 $10 的围巾降价 20%。之后价格再次下调，这次是下调后价格的一半。现在的价格是
- A. / 2.00 美元
- B. / 3.75 美元
- C. / 4.00 美元
- D. / 4.90 美元
- E. / 6.40 美元
正确答案 · Correct Answer
C
解析 · Solution
Solution 1
100%-20%=80%, 10×80%=10×0.8, 10×0.8=8, .
The first discount has percentage 20, which is then discounted again for half of the already discounted price.
100-20=80, ,
继续练习