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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality Q*(150-90)*0.9+(8000*(150-90)+(Q-8000)*(20-90))*0.1 <= 558000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         Q * ( 150 - 90 ) * 0.9 + ( 8000 * ( 150 - 90 ) + ( Q - 8000 ) * ( 20 - 90 ) ) * 0.1 <= 558000         (1)

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    From inequality(1)：
         Q ≤ 13000/9

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    The final solution set is :
         Q ≤ 13000/9

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