$\boxed{907 \; \text{kg} = 1 \; \text{ton}}$
$12$ Million ton = $(12 \times 10^{6} \times 907) \; \text{kg} = 10884 \times 10^{6} \; \text{kg}$
$31\%$ volumn used for rail and road
So, Total volumn used for rail and road $= 10884 \times 10^{6} \times (31/100) = 337404 \times 10^{4} \; \text{kg}$
Cost of transportation for rail and road $=30 \times 10^{6} \times (18/100) = 540 \times 10^{4} \; \text{Rs}$
Cost of $(337404 \times 10^{4} \; \text{kg}) = 372 \times 10^{4} \; \text{ton}$ is $540 \times 10^{4} \; \text{Rs}$
" " $1$ " " $1.45 \; \text{Rs}$
Answer $: 2$