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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 100*(1-4%) ≤100（1+x）*0.8 ≤100（1+4%） .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        100 * ( 1 - 4 % ) ≤100 * ( 1 + x ) * 0.8         (1)
        100 * ( 1 + x ) * 0.8 ≤100 * ( 1 + 4 % )         (2)

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    From inequality(1)：
         x ≥ 1/5
    From inequality(2)：
         x ≤ 3/10

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    From inequalities (1) and (2)
         1/5 ≤ x ≤ 3/10    (3)

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    The final solution set is :
         1/5 ≤ x ≤ 3/10

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