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      Question

      Monthly salaries of β€˜A’ and β€˜B’ are in the

      ratio 4:5, respectively. Monthly expenditure of β€˜A’ is 30% of monthly savings of β€˜B’. If β€˜B’ spends 20% of his monthly salary, then monthly savings of β€˜A’ is:
      A 65% of his monthly income Correct Answer Incorrect Answer
      B 68% of his monthly income Correct Answer Incorrect Answer
      C 70% of his monthly income Correct Answer Incorrect Answer
      D 72% of his monthly income Correct Answer Incorrect Answer
      E 75% of his monthly income Correct Answer Incorrect Answer

      Solution

      Let monthly salary of β€˜A’ = Rs. β€˜4x’ So, monthly salary of β€˜B’ = (5/4) Γ— 4x = Rs. β€˜5x’ Monthly expenditure of β€˜B’ = 0.20 Γ— 5x = Rs. β€˜x’ So, monthly savings of β€˜B’ = (5x – x) = Rs. β€˜4x’ Therefore, monthly expenditure of β€˜A’ = 0.30 Γ— 4x = Rs. β€˜1.2x’ So, monthly savings of β€˜A’ = (4x – 1.2x) = Rs. β€˜2.8x’ Required percentage = {(2.8x)/4x} Γ— 100 = 70%

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