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 120, exactly as in the question.
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Since 100% is one as a whole, 120% is 1.20 as a decimal.
change 17.5% into a decimal and than multiply by 120
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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 120, exactly as in the question.
91 ÷ 120 × 100 = 75.83% (to 2 decimal places)