Divide ppm by 10,000:
50,000 / 10,000 = 5 %
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ppm means parts per million; percent basically means parts per hundred. Therefore, to convert from ppm to percent you should divide by 10,000.
1 ppm = 0.0001 percent. Now go forth and convert.I'll do the first one for you: Zero ppm = Zero percent.
by "ppm" I assume you mean "parts per million". 30 percent means 30 per 100, and 1,000,000 (a million) divided by 100 is equal to 10,000. This is the ration between ppm and percent. 30x10,000 is equal to 300,000, so 30 percent is equal to 300,000 ppm
Multiply ppm by 10000.
20000 ppm = 2%