Because years 1-100 are in the first century; years 101-200 are in the second century, and so on... 2010 is in the 21st century.
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20 years is less than a century. A century is 100 years. So 20 years is one fifth of or 20% of a century.
21-20 = 1
what years were covered by the 20 century
20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.
21% of 20.00= 21% * 20= 0.21 * 20= 4.20