A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 12100, exactly as in the question.
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12100
0
As a decimal it equals .2 and as a percentage it equals 20%
It is: 110
5% as a decimal is: 0.05