3.20 is the same as 3.2 and they are equivalent decimals
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It is simply 320.0 as a decimal
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 -320, exactly as in the question.
88% of 320= 88% * 320= 0.88 * 320= 281.6
27% of 320= 27% * 320= 0.27 * 320= 86.4
320