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Ngọc đang quản lý một quỹ đầu tư với số vốn là 10.000 USD, hệ số beta bằng 1,05 và tỷ lệ lợi nhuận kỳ vọng 12%. Tỷ lệ sinh lời của tài sản phi rủi ro là 4,75%. Nếu Ngọc nhận được thêm 10.000 USD và quyết định đầu tư vào một số cổ phiếu có hệ số beta bình quân bằng 0,65 thì tỷ lệ lợi nhuận kỳ vọng của danh mục đầu tư 20.000 USD bằng bao nhiêu?

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