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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 100x+150*(30-x) ≥3900 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        100 * x + 150 * ( 30 - x ) ≥3900         (1)

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    From inequality(1)：
         x ≤ 12

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    The final solution set is :
         x ≤ 12
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 100x+150*(30-x) ≤4000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        100 * x + 150 * ( 30 - x ) ≤4000         (1)

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    From inequality(1)：
         x ≥ 10

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    The final solution set is :
         x ≥ 10

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