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55. Mức hoàn vốn mong muốn trong số tiền tăng thêm của giá bán là:a. ước tính khác nhau tùy theo sản phẩm có chu kỳ sống ngắn hoặc dàib. ước tính khác nhau tùy theo mô trường cạnh tranhc. ước tính khác nhau theo từng thời kỳ kinh doanhd. cả 3 đáp án trên đều đúng

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