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parts per million = ppm
Nickel is an element. Therefore, in any nickel item it is 1 billion parts per 1 billion or 1 million parts per million.
1% is 10,000 parts per million.
0.0035% Parts per million can be converted to parts per hundred by dividing by 10,000 or setting up a proportion. 35 ppm = 0.0035 parts per hundred. hence percentage it is 0.0035%
42 over 80 means 42 parts per 80. Percent means parts per 100. So, we need to convert the parts per 80 to parts per 100. Since 1.25 times 80 is 100, we can do this by multiplying the parts per 80 by 1.25. 1.25 times 42 is 52.5. Therefore, 42 over 80 equals 52.5 percent.