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Q. In a certain year, the average monthly income of a person was ₹ 3,400. For the first eight months of the year, his average monthly income was ₹ 3,160 and for the last five months, it was ₹ 4,120. His income in the eighth month of the year was

  • (A) ₹ 3,160
  • (B) ₹ 5,080
  • (C) ₹ 15,520
  • (D) ₹ 5,520
  • Correct Answer - Option(B)
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Explanation by: Admin
Given that , average income of a person = ₹ 3,400
Sum of annual income of a person = ₹ ( 3,400 x 12 )
Sum of first eight month income of a person = ₹ ( 3160 x 8 )
Sum of last five month income of a person = ₹ ( 5 × 4120 )
∴ Person’s income in the eighth month = (3160 × 8 + 5 × 4120 – 12 × 3400)
Person’s income in the eighth month = (25280 + 20600 – 40800) = 5080

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