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Home » Looking back: all sample answers are integers - Crosslake

Looking back: all sample answers are integers - Crosslake

📅 March 1, 2026 👤 scraface

Mar 01, 2026

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📌 年初 price：10

📌 年末（涨后）：\( 10 \times 1.25 = 12.5 \)$

📌 年末（折后）：\( 12.5 \times 0.8 = 10 \)

📌 若第二年卖出，价格仍 $10， Verkauf 收入为 \( 1000 \times 10 = 10,000 \)

📌 初始投入 $10,000，结尾值 $10,000，no gain？不理想。

📌 调整买入策略：假设初始投入 $1000，买入1000股 $1股，第一年涨25%至 $1.25，归盘市值：1250；随后下跌20%至 $1.00，卖出全部：1000 × 1.00 = 1000 < 1000? 亏损。

📌 改造：假设第一年涨25%，价格成为 1.25美元，卖出，哪怕第二年下跌，设价格为新 cost basis，but motion为以市价为基。

📌 题目：** 某投资者买入1000股，单价 $10，持有一年后股价分别为：第一年上涨25%至 $12.5，第二年下跌20%至 $10，卖出全部股票。若按平均成本计算，是否盈利？求年化收益率。

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