To express 12,000 as a percentage, you would need to divide 12,000 by the total or whole amount it is in relation to and then multiply by 100. For example, if 12,000 is out of 50,000, you would calculate (12,000 / 50,000) * 100 = 24%. This means 12,000 is 24% of 50,000.
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1 in a billion as a percentage = 100 * 1/1 000 000 000 = 1/10 000 000 or 0.0000001 %
10 ppm as a fraction is 10 / 1 000 000 = 0.00001, as a percentage = (10 / 1 000 000) * 100 = 0.001 %
If the question is about WRITING 12 billion, the answer is 12 000 000 000
43,000 as a percentage of 100,000 = 100*43,000/100,000 = 43%
Scientific notation of 12 000