A dealer mixes 12 kg of coffee costing Rs. 80 per kg with 8 kg of coffee costing Rs. 105 per kg. What is the cost of the mixture per kg?
Correct answer D. Rs. 90
Explanation
Total cost = 12 x 80 + 8 x 105 = 960 + 840 = Rs. 1800 for 20 kg, so cost per kg = Rs. 90.
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