A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of  25.·gL−1 . The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of  4.2·gL−1 .   Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Round each of your answers to  2  significant digits.

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