7 kg of tea costing Rs. 280 per kg is mixed with 9 kg of tea costing Rs. 240 per kg. The average price per kg of the mixed tea is ?

Answer: Option B

According to the question,
Average price of mixed tea
$$\begin{array}{rl}& \text{ = }\frac{280\times 7+240\times 9}{16}\\ & \text{ = }\frac{1960+2160}{16}\\ & \text{ = }\frac{4120}{16}\\ & \text{ = Rs}\text{. 257}\text{.50}\end{array}$$