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JAMB Mathematics 1999 Question 6

Question 6

Commercial Arithmetic

A trader bought 100 oranges at 5 for N1.20, 20 oranges got spoilt and the remaining were sold at 4 for N1.50. Find the percentage gain or loss.

  1. A.30% gain
  2. B.25% gain
  3. C.30% loss
  4. D.25% loss
Show the answer and explanation

Answer: B (25% gain)

Explanation

Cost = 20 × N1.20 = N24. He sells 80 oranges: 20 × N1.50 = N30. Gain = N6, and 6/24 × 100 = 25% gain.