0.005
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One half of a percent as a decimal is expressed as .005 Percent is out of 100 or 1 in most cases. 99 cents equal 1 dollar, so one HALF of ONE percent is .005 because one out of 100 = .01 so half of that would be .005 because .005 + .005 = .01
Reduced to a vulgar fraction in its lowest terms, 12.5% is equal to 1/8, or one eighth.
0.5 percent (0.5%) is one half percent. 0.5 is one half or 50 percent. The "cent" part comes from the Latin and means "100", and is the same root used in "centurion" (Roman soldiers were organized into groups of 100), "century" (100 years), "cent" (100 cents in a dollar), "centipede" (100 feet).
The answer to two and a half percent is easy. Simply find one percent,double it to get two percent and then half one percent to find the half. Put them together and you have two and a half percent.
One half of one percent = 0.005