The cost C(x) (in $1000) for a city to remove x% of the waste from a polluted river is given by C(x)=80x/(100-x)   1)Determine the cost to remove 20%, 40%, and 90% of the waste. Round to the nearest thousand dollars.   2)If the city has $320,000 budgeted for river cleanup, what percentage of the waste can be removed?

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