Because you could never get 100% of the germs. When brands state their cleaners remove 99.9% of germs, the other 0.1% are either good germs or simply are too tough to be removed.
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Need value of 100 to answer or the other 99 percent.
It is: 99%
99 percent as a fraction = 99/10099% = 99/100 in fraction
99% = 99/100 which cannot be simplified.
To convert decimals to percents, multiply by 100. .99*100= 99%.