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2013/09/24
以下是转载，但回答太清晰了。特此摘录。
by karasantoso
Margin is used to compare A relative to B, where A is part of B. Margin is usually stated as a percentage.
Followings are two examples of margins:
1. Gross profit margin = Gross profit / revenue;
2. Net profit margin = Earning after tax / revenue;
