Look at the information about four different polymers: PolymerCost (£ per kg)Tensile strength (MPa)Melting point (∘C)Maximum useable temp. (∘C)W0.853011080X1.1540165120Y1.6545170120Z1.307022090\begin{array}{|c|c|c|c|c|} \hline \text{Polymer} & \text{Cost (£ per kg)} & \text{Tensile strength (MPa)} & \text{Melting point } (^\circ\text{C}) & \text{Maximum useable temp. } (^\circ\text{C}) \\ \hline \text{W} & 0.85 & 30 & 110 & 80 \\ \hline \text{X} & 1.15 & 40 & 165 & 120 \\ \hline \text{Y} & 1.65 & 45 & 170 & 120 \\ \hline \text{Z} & 1.30 & 70 & 220 & 90 \\ \hline \end{array}PolymerWXYZ​Cost (£ per kg)0.851.151.651.30​Tensile strength (MPa)30404570​Melting point (∘C)110165170220​Maximum useable temp. (∘C)8012012090​​