A dry-fruit seller mixes three varieties of walnuts costing Rs.50, Rs.20 and Rs.30 per kg in the ratio 2 : 4 : 3 in terms of weight and sells the mixture at Rs.33 per kg. What percentage of profit does he make?

Assume the seller mixes 9 kg of walnuts to easily match the 2:4:3 ratio, meaning 2 kg at Rs. 50, 4 kg at Rs. 20, and 3 kg at Rs. 30. The total cost price for the 9 kg mixture is (2 * 50) + (4 * 20) + (3 * 30) = 100 + 80 + 90 = Rs. 270. The cost price per kg is 270 / 9 = Rs. 30. Selling the mixture at Rs. 33 per kg yields a profit of 33 - 30 = Rs. 3 per kg, so the profit percentage is (3 / 30) * 100 = 10%.

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