12.75 already is a decimal number
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It is simply 1275.0 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 1275, exactly as in the question.
15% of 1275= 15% * 1275= 0.15 * 1275= 191.25
26775
2x2x2x2x2x2x2x2x2x2=1024 3x5x5x17=1275