At a certain industrial manufacturer, an open tank contains \(6\%\) fluorine dissolved in water. If the tank holds \(1000\) gallons, and \(10\) gallons of the total volume evaporate as water each day, what is the concentration of fluorine after \(25\) days?
A. \(4\%\)
B. \(6\%\)
C. \(8\%\)
D. \(10\%\)
E. \(15\%\)
Answer: C
Source: Veritas Prep