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 81000, exactly as in the question.
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81000.00
40 as a decimal would just be 40.0
To write 47 units in decimal form, you simply write "47.0". This is because the decimal form of a whole number is the number followed by a decimal point and a zero. In this case, the whole number 47 is written as 47.0 in decimal form.
20/100 as a decimal is 0.20
0.5 is already in the form of a decimal fraction.