Question

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=6000/(200-2x).

a. What is the cost to remove 75% of the pollutant?
C=6000/(200-2(.75))
C=6000/(200-1.5)
C=6000/198.5
C=30.2
Is this correct?

This is stumping me to:
For what value is this equation undefined?

Thanks in advance.