A tank originally contains 100 gal of fresh water. Then

A tank originally contains 100 gal of fresh water. Then water containing 1/2 lb of salt per gallon is poured into the tank at a rate of 2 gal/min and the mixture is allowed to leave at the same rate. After 10 min the process is stopped, and fresh water is poured into the tank at a rate of <9 gal/min>, with the mixture again leaving at the same rate. Find the amount of salt in the tank at the end of an additional 10 min.
Round your answer to two decimal places.

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