1000 mg of granular salt is briefly stirred into a glass container of 1/4 liter volume filled with water.     After briefly mixing, some salt is still seen at the bottom of the glass.  The undissolved salt is filtered from the water, weighed and determined to have a mass of 200 mg.    What is the dissolved phase concentration of salt remaining in the water?  Provide your answer to the nearest whole number in units of mg/l.

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