Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1000×8×400＋（y-1000）×5×400 ≥5000000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 × 8 × 400 + ( y - 1000 ) × 5 × 400 ≥5000000         (1)

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    From inequality(1)：
         y ≥ 1900

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    The final solution set is :
         y ≥ 1900

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