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 20, exactly as in the question.
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20 hundredths in decimal form is 0.2.
0.051/20:= 1 ÷ 20= 0.05 in decimal
decimal form of 2 and 20 hundredths = 2.20 or 2.2
The decimal form of 1/20 is 0.05.
13/20 as a decimal is 0.65