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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (500+a)×90×(1.5-60)×0.8-(500+a)×(-15)×0.2 ≥15000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 500 + a ) × 90 × ( 1.5 - 60 ) × 0.8 - ( 500 + a ) × ( -15 ) × 0.2 ≥15000         (1)

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    From inequality(1)：
         a ≤ -503.563792

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    The final solution set is :
         a ≤ -503.563792

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