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Mathematics, 25.11.2021 05:50 genyjoannerubiera

Một hiệu sách đại học có thể bán quyển sách Countshing Rituals Of The American College Student với giá 4 đô la một bản (copy của nhà xuất bản). Người quản lý hiệu sách tin tưởng rằng bà ta có thể bán 180 bản copy với giá 10 đô la và rằng nếu mỗi bản copy giảm đi 50 cent thì sẽ bán thêm được 30 bản copy. Giá nào sẽ là giá bán của quyển sách để cho lợi nhuận của cửa hàng là lớn nhất.

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