A Factory Is Polluting a River Such That at Every

question 93

Multiple Choice

A factory is polluting a river such that at every mile down river from the factory an environmental expert finds 15% less pollutant than at the preceding mile.If the pollutant's concentration is 600 ppm (parts per million) at the factory,what is its concentration 12 miles down river? ​

• A) 180 ppm
• B) ​90 ppm
• C) ​85.35 ppm
• D) 705.88 ppm
• E) ​100.41 ppm