$A$ sample of drinking water is found to be severely contaminated with chloroform $(CHCl_3)$,which is a suspected carcinogen. If the level of contamination is $15 \ ppm$ (by mass),express this in percentage by mass.
- A$1.6 \times 10^{-2}$
- B$1.5 \times 10^{-3}$
- C$1.8 \times 10^{-2}$
- D$1.9 \times 10^{-2}$
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