<PRE><B>Question 453324</B>
The function f(x)=180x/(100-x) models the cost f(x) in millions of dollars to remove x% of a rivers pollutants. 
If the government commits $540 million for this project
what is the percentage of pollutants that can be removed?
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540 = (180x)/(100-x)
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Cross multiply to get:
54000-540x = 180x 
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720x = 54000
x = 75
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75% of the pollutants can be removed.
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Cheers,
Stan H. 

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