Quick Answer:

Sites C and E have the most similar percentages.

Complete Solution:

Using the hint, find the difference in the percentages of each material at each pair of sites and sum these differences. The resulting information can be arranged in a table as shown. In this table, the cell in row A, column B, corresponds to the sum of the differences for sites A and B, or 90%. (Since there is no difference between a site and itself, the corresponding cells have 0% as entries.)

 A B C D E A 0% 90% 100% 100% 64% B 90% 0% 110% 84% 84% C 100% 110% 0% 124% 36% D 100% 84% 124% 0% 104% E 64% 84% 36% 104% 0%

The pair of sites with the smallest sum (36%) is C and E. This indicates that the percentages of materials at the two sites are the most similar.

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