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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （260x+40x×70%-12800）÷12800 ≥80% .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 260 * x + 40 * x × 70 % - 12800 ) ÷ 12800 ≥80 %         (1)

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    From inequality(1)：
         x ≥ 80

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    The final solution set is :
         x ≥ 80

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