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      Question

      Because of a 10% rise in mobile data prices, Ayesha decided

      to use 15% less data. Find out the percentage change in her data expenses.
      A 4.5% decrease Correct Answer Incorrect Answer
      B 2.5% increase Correct Answer Incorrect Answer
      C 6.5% decrease Correct Answer Incorrect Answer
      D 5.5% increase Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let initial data price be Rs. 100a and data usage be 100b GB

      Initial expenditure = 100a Γ— 100b = Rs. 10000ab

      New expenditure = (1.10 Γ— 100a) Γ— (0.85 Γ— 100b) = Rs. 9350ab

      Required percent = [(9350ab - 10000ab) Γ· 10000ab] Γ— 100 = -6.5% decrease

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