Discussion

Explanation:

Required Cost = $\frac{\mathrm{Total} \mathrm{cost} \mathrm{by} \mathrm{Rail} \mathrm{and} \mathrm{Road} \mathrm{in} \mathrm{millions}}{\mathrm{Total} \mathrm{Crude} \mathrm{oil} \mathrm{transported} \mathrm{by} \mathrm{Rail} \mathrm{and} \mathrm{Road} \mathrm{in} \mathrm{million} \mathrm{tons}}$

$$\begin{gathered} =\frac{\left({\displaystyle \frac{12+6}{100}}\right)\times 30}{\left({\displaystyle \frac{9+22}{100}}\right)\times 12} \\ =\frac{18}{12}\times \frac{30}{31} \end{gathered}$$

≈ 1.5

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