f(x)=120x / 100-x Suppose that in a certain city a lake has become polluted. The city wishes to assess the cost…

f(x)=120x / 100-x Suppose that in a certain city a lake has become polluted. The city wishes to assess the cost of removing the pollutants. Their environmental analysts determine that the cost-benefit function models the cost, f(x), in thousands of dollars to romove x% of the pollutants. What does x represent?