The decimal part of 40 is 40 so the answer is 4080.
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It is: 102 and 9/10 = 102.9 as a decimal
decimal for 40 = 40.0
1.02
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 102 250, exactly as in the question.
40 as a decimal would just be 40.0