2007 AMC 10A 第 1 题

Question

一张演出票全价为

\$20

。Susan 使用一张

25\%

折扣券买了

4

张票。Pam 使用一张

30\%

折扣券买了

5

张票。Pam 比 Susan 多付多少美元？

One ticket to a show costs

\$20

at full price. Susan buys

4

tickets using a coupon that gives her a

25\%

discount. Pam buys

5

tickets using a coupon that gives her a

30\%

discount. How many more dollars does Pam pay than Susan?

2

5

10

15

20

25\%

折扣表示支付全价的

75\%

。

A

25\%

discount means paying

75\%

of the full price

分别计算两人的总费用，再相减。

Compute each person’s total, then subtract

Susan 支付

4 \cdot 0.75 \cdot 20 = 60

美元。

Pam 支付

5 \cdot 0.70 \cdot 20 = 70

美元。

差为

70 - 60 = 10

美元。

所以正确答案是 C。

Susan pays

4 \cdot 0.75 \cdot 20 = 60

dollars.

Pam pays

5 \cdot 0.70 \cdot 20 = 70

dollars.

The difference is

70 - 60 = 10

dollars.

Thus, the correct answer is C.

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