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Half the number = total number divided by 2, and their percentage, by definition, is 50.
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.
half it, than half it again, then add the first half and the second half you made together.
How to calculate the number of units sold?
take it literally...you have the number 8 and then you cut it in half vertically down the middle....