1997 AMC 8 第 16 题
先试着解答 1997 AMC 8 第 16 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1997 AMC 8 解答，或核对答案。
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16.
佩妮·普里赛斯利在三家公司各买了价值 的股票：阿拉巴马杏仁公司、波士顿豆业公司和加利福尼亚花椰菜公司。一年后，AA 上涨 ，BB 下跌 ，CC 不变。第二年，AA 比前一年下跌 ，BB 比前一年上涨 ，CC 仍不变。如果 、 和 是这些股票的最终价值，那么
Penni Precisely buys worth of stock in each of three companies: Alabama Almonds, Boston Beans, and California Cauliflower. After one year, AA was up BB was down and CC was unchanged. For the second year, AA was down from the previous year, BB was up from the previous year, and CC was unchanged. If and are the final values of the stock, then
答案：E
小提示：
先上涨百分之 ，再下跌百分之 ，并不会回到原值
A percent gain followed by a percent loss does not return to the start
大提示：
百分比变化要用乘法因子逐步计算
Apply each percent change multiplicatively
解答：
第一年后，AA 的价值变为 BB 的价值变为
第二年后，AA 的价值为 BB 的价值为
CC 价值仍不变，所以最终顺序是
所以正确答案是 E。
After the first year, AA’s stock’s worth goes up to and BB’s goes down to
After the second year, AA’s stock is worth and BB’s is worth
CC’s stock worth remains the same, so the ordering of the stock worths is now
Thus, E is the correct answer.
其他年份的第 16 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
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- 1993 AMC 8
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