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Two varieties of wheat - A and B costing Rs. 9 per kg and Rs. 15 per kg were mixed in the ratio 3 : 7. If 5 kg of the mixture is sold at 25% profit, find the profit made?

Correct answer: D. Rs. 16.50

  • A. Rs. 13.50
  • B. Rs. 14.50
  • C. Rs. 15.50
  • D. Rs. 16.50
  • E. None of these

Explanation

The mixture costs (3 kg x Rs.9 + 7 kg x Rs.15) / 10 kg = Rs.13.20 per kg. For 5 kg, cost price is 5 kg x Rs.13.20 per kg = Rs.66, and a 25% profit is Rs.66 x 25/100 = Rs.16.50. The likely mistake is option a, Rs.13.50, from using an incorrect average cost.

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