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A tannery extracts mangrove bark containing 4% moisture, 37% tannin, and 23% soluble non-tannin material. The...

  1. A tannery extracts mangrove bark containing 4% moisture, 37% tannin, and 23% soluble non-tannin material. The residue removed from the extraction tank contains 62% moisture, 2.8% tannin, and 0.9% soluble non-tannin material. What percentage of the tannin in the original bark remains unextracted in the residue?
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