Since ppm=parts per million, 2000 ppm = 2000/1000000 = 0.002 = 0.2%
30% of 2000 = 2000*30/100 = 600
$2.
It is 1/100 of a whole.
generally, percentage is a fraction whose denominator is a hundred,.eg 65 % = 65 / 100 or sixty five hundredths or 0.65 of something
MM
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