Question

假设把送一个人去火星的估计费用 $20$ 十亿美元，平均分摊给美国 $250$ 百万人。那么每个人应分摊

Suppose the estimated $20$ billion dollar cost to send a person to the planet Mars is shared equally by the $250$ million people in the U.S. Then each person's share is

$40

$50

$80

$100

$125

答案：C

知识点：位值

难度评级：730

解答：

每人的份额是 $\dfrac{20 \text{ billion}}{250 \text{ million}} = \dfrac{2 \times 10^{10}}{2.5 \times 10^{8}}$ 。

这等于 $.8 \times 10^{2} = 80$ 。

所以正确答案是 C。

Each person's share is $\dfrac{20 \text{ billion}}{250 \text{ million}} = \dfrac{2 \times 10^{10}}{2.5 \times 10^{8}}.$

This equals $.8 \times 10^{2} = 80.$

Thus, the correct answer is C .

1988 AMC 8 第 12 题

答案：C

难度评级：730

解答：

其他年份的第 12 题