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/ 初始成本：\( 500 \times 20 = 10,000 \)
初始成本：\( 500 \times 20 = 10,000 \)
February 22, 2026
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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。
第一年末市值：\( 500 \times 30 = 15,000 \)
第二年末市值：\( 500 \times 24 = 12,000 \)
卖出总收益：12,000 < 10,000? 不可能 — 不可能下跌后卖出得价更高。
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