Bạn A đi làm thêm ở tiệm cà phê , nếu một ngàu bán được 50 ly thì nhận được mức lương cơ bản là 150000, bên cạnh đó với mỗi ly bán vượt chỉ tiêu sẽ được thưởng thêm 40 phần trăm so với tiền lời một ly cà phê . Ngày đầu tiên đi làm bạn được nhận 222000 . Tính số ly đã bán trong ngày đầu tiên biết rằng tiền lời một ly là 6000đồng

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