Q. 12 kg of rice costing 30 Rs. per kg is mixed with 8 kg of rice costing 40 Rs. per kg. The average per kg price of mixed rice is:
Answer: 34 Rs
Notes: Total cost price of 20 kg of mixed rice $latex = (12\times 30 + 8 \times 40) = 680Rs.$ ∴ Average per kg price $latex = \frac{680}{20} = 34Rs.&s=1$ Hence option [A] is the right answer.

2