A company often needs to send employees on business trips, every time 10 employees are sent. This company intends to spend 3,000,000 yuan to buy a 10-seat private jet. The cost of this plane is 6,000 yuan per take-off. If the company don't t buy a plane, the company's staff will spend 1,000 yuan per flight. How many times will the plane fly to make it more cost-effective to buy a private jet?
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正确答案: D