Option 3 : Rs. 380 per kg

**Given:**

5 kg of tea costing Rs. 240 per kg is mixed with 10 kg of tea costing Rs. 450 per kg to form a new mixture of tea.

**Concepts used:**

The average cost of mixture = (Total cost of components used to form the mixture)/(Total quantity of mixture)

**Calculation:**

Total cost of 5 kg tea = 240 × 5 = Rs. 1,200

Total cost of 10 kg tea = 450 × 10 = Rs. 4,500

Total cost of both components used to form mixture = Rs. 1200 + Rs. 4500 = Rs. 5,700

Average cost of mixture = Total cost of components used to form the mixture/Total quantity of mixture

⇒ Rs. 5,700/(10 + 5) kg

⇒ Rs. 5,700/15 kg = Rs. 380 per kg

**∴ The average cost of new mixture of tea formed is Rs. 380 per kg.**