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      Question

      Due to a 50% rise in fuel prices, Arjun decides to reduce

      his usage by 40%. Find the net percentage change in his fuel expenses.
      A 10% decrease Correct Answer Incorrect Answer
      B 12% increase Correct Answer Incorrect Answer
      C 16% decrease Correct Answer Incorrect Answer
      D 18% increase Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let initial fuel price be Rs. 100a and initial consumption be 100b litres

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

      New expenditure = (1.50 Γ— 100a) Γ— (0.60 Γ— 100b) = Rs. 9000ab

      Required percent = [(9000ab - 10000ab) Γ· 10000ab] Γ— 100 = -10% decrease

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