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How many gram of sodium fluoride should be added to 100000 liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm?

Answer is 115 grams. I keep getting .115 g What am I doing wrong? Please help.

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2 answers
  1. Nevermind. I figured it out.

    Key was 1 ppm is 1mg/L.

    1.15 mg/L * 100,000 L = 115,000 mg (115g)

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  2. If a topical cream contains 1.8% (w/w) of hydrocortisone, which of the following strengths is equivalent?

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