A portion of 2.2418 g of technical sodium tetraborate was dissolved in a volumetric flask with a capacity of 100.00 ml. For titration of 20.00 ml of this solution, 25.50 ml of hydrochloric acid with a sodium hydroxide titer of 0.003974 g/ml were used. Calculate the percentage of sodium tetraborate Na2B4O7*10H2O in the sample.

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