Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 1000m+800(20-m) ≤19200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 * m + 800 * ( 20 - m ) ≤19200         (1)

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    From inequality(1)：
         m ≤ 16

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    The final solution set is :
         m ≤ 16
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 1000m+800(20-m) ≥17800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 * m + 800 * ( 20 - m ) ≥17800         (1)

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    From inequality(1)：
         m ≥ 9

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    The final solution set is :
         m ≥ 9

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