10 litre of mustard oil at ₹120 per litre is mixed with 15 litre at ₹100 per litre. What is the price per litre of the mixture?

Explanation

1. 01

   Total cost: $10 \times 120 + 15 \times 100 = 2,700$ rupees, for 25 litre.

2. 02

   Mean price $= \frac{2,700}{25} = 108$ rupees per litre.