Question

$1996$ 年秋季，共有 $800$ 名学生参加一年一度的学校清洁日。活动组织者预计，在 $1997, 1998$ 和 $1999$ 每一年，参与人数都会比前一年增加 $50\%$ 。组织者预计 $1999$ 年秋季会有多少名参与者？

In the fall of $1996$ , a total of $800$ students participated in an annual school clean-up day. The organizers of the event expect that in each of the years $1997, 1998,$ and $1999$ , participation will increase by $50\%$ over the previous year. The number of participants the organizers expect in the fall of $1999$ is

$1200$

$1500$

$2000$

$2400$

$2700$

答案：E

知识点：百分数等比数列

难度评级：930

解答：

每一年人数乘以 $1.5$ ： $800 \to 1200 \to 1800 \to 2700$ 。

所以 $1999$ 年预计人数是 $800 \cdot 1.5^3 = 2700$ 。

所以正确答案是 E。

Each year multiplies the count by $1.5$ : $800 \to 1200 \to 1800 \to 2700$ .

So $800 \cdot 1.5^3 = 2700$ participants are expected in $1999$ .

Thus, the correct answer is E .

1996 AMC 8 第 13 题

答案：E

难度评级：930

解答：

其他年份的第 13 题