The purification of industrial waste is often a destructive process with many beneficial components removed from the waste as part of the cleansing process. As part of some trials to reuse industrial sludge as a mulch for planting, conservation of existing nitrogen levels in the sludge is being studied. Nitrogen is used in plants to synthesize amino acids, proteins, chlorophyll, nucleic acids, and enzymes. Initial testing showed 1 kg of sludge contained 254 mg of nitrogen and after the cleaning process there were 189 mg of nitrogen left. What is the percentage reduction of nitrogen?

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