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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （150-150a%)×80+（180-180a%)×100 ≥222000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 150 - 150 * a % ) × 80 + ( 180 - 180 * a % ) × 100 ≥222000         (1)

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    From inequality(1)：
         a ≤ -640

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    The final solution set is :
         a ≤ -640

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