\textbf{平均增益率（乘法）：}

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• \[ (1 + r)^1 = \frac{\text{终值}}{\text{初值}} = \frac{10}{10} = 1 \]
• {{ WAIT: 若第二年不变，r=0.}}。
• 假设第一年涨25%（valuation $12.5），第二年价格变动但未明确，设为涨跌均摊：
• 各期增益因子：1.25 × 0.8 = 1.00
• 年化增益率 = \( 1.00^{1} - 1 = 0\% \)
• 题目：** 某投资者以20美元/股买入500股（总额1000美元）。第一年股价上涨25%至30美元，第二年下跌20%至24美元，第二年底卖出全部股票。计算年化收益率。

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