a geochemist measures the concentration of salt dissolved in lake parsons, an isolated salt lake. he finds a concentration of 28. g*L^−1. the geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 2.4 g*L^−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.