2005 AMC 10A 第 1 题

Question

外出就餐时，Mike 和 Joe 各给服务员

\$2

的小费。Mike 的小费是他账单的

10\%

，Joe 的小费是他账单的

20\%

。他们账单相差多少美元？

While eating out, Mike and Joe each tipped their server

\$2.

Mike tipped

10\%

of his bill and Joe tipped

20\%

of his bill. What was the difference, in dollars, between their bills?

2

4

5

10

20

小费等于账单的

10\%

，表示账单是小费的

10

倍。

A tip equal to

10\%

of a bill means the bill is

10

times the tip

先由小费求出两人的账单，再相减。

Recover each bill from its tip, then subtract

Mike 的

\$2

小费是账单的

10\%

，所以他的账单是

2 \times 10 = 20

美元。Joe 的

\$2

小费是账单的

20\%

，所以他的账单是

2 \times 5 = 10

美元。差为

20 - 10 = 10

美元。

所以正确答案是 D。

Mike’s

\$2

tip is

10\%

of his bill, so his bill is

2 \times 10 = 20

dollars. Joe’s

\$2

tip is

20\%

of his bill, so his bill is

2 \times 5 = 10

dollars. The difference is

20 - 10 = 10

dollars.

Thus, the correct answer is D.

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