设初始持股价格为 \( p \) 美元，买入数量为：

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• \[ \text{弧长 } = 10 \times \frac{\pi}{3} = \frac{10\pi}{3} \text{ cm} \]
• #### \( \frac{10\pi}{3} \) cm or approximately 10.47 cm
• 一名投资者购入股票1000美元。在一年后，股票价格上涨25%，但投资者在价格下跌20%的第二天卖出了部分股票。若剩余股票价值仍为800美元，投资者最初卖出的是多少美元 worth的股票？
• \[ \frac{1000}{p} \text{ shares} \]
• \[ p \times 1.25 \]
• 随后第二天下跌20%，新售价为：

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