Thanks in advance,
You originally had a base number, b, of items divided into categories. If some particular category had c items in it then the percentage in that category is (c/b)x100. Now you want to remove one of the categories that has 13% of the items so the resulting new base number is 87% of b, that is (87/100)xb. The resulting fraction of the items in this category is now
That is the new percentage in this category is the original percentage divided by 87.
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