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      Question

      Milk becomes 15% costlier. Find the percentage decrease

      in usage to maintain the same expenditure.Round to the nearest whole number.
      A 13 % Correct Answer Incorrect Answer
      B 30 % Correct Answer Incorrect Answer
      C 17 % Correct Answer Incorrect Answer
      D 29 % Correct Answer Incorrect Answer

      Solution

      ATQ,

      Initial price = Rs. 100m, consumption = n

      Initial expenditure = 100mn

      New price = 115m

      New consumption = 100mn ÷ 115m = 100n ÷ 115

      Decrease = n - (100n ÷ 115) = 15n ÷ 115

      Required percent = (15n ÷ 115) ÷ n × 100 = 1500 ÷ 115 ≈ 13%

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