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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    The price of cooking oil has increased by 25%. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is:

    A) 15%                      

    B) 20%

    C) 25%                      

    D) 30%               

    Correct Answer: B

    Solution :

    Let the price of cooking oil = Rs.100 Increase in price = 25% of 100 = 25 \[{{b}_{2}}\] Increased price \[\frac{{{a}^{2}}}{{{b}^{2}}}=k\] Required percentage of Reduction \[\frac{{{a}_{1}}}{{{b}_{1}}}=\frac{{{a}_{2}}}{{{b}_{2}}}\]      [see formular]


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