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
Answer: C
Mathematics
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Mathematics