Refer to the data below and answer the questions that follow.
Quantity of Iron = (Quantity of zinc/Quantity of copper) $\times ~20$
The above line graph shows the quantity of zinc and copper in the five alloys which are made up of multiple elements. The quantity of iron in each alloy can be calculated using the given formula. (Assume that the quantity of each alloy is 300 kg)
If we arrange all the alloys in the ascending order of the quantity of iron in them, which alloy will be the center of the list?