The Gross Margin of Tanke Biosciences Corp (TNBI) is 34.82%.
Gross Margin represents the percentage of revenue that exceeds the cost of goods sold. It reflects a company's efficiency in producing and selling its products.
| Date | Value |
|---|---|
| 2012-12-31 | 34.82% |
| 2011-12-31 | 36.80% |
| 2010-12-31 | 36.82% |