The rational number for the number -3.20 would be 4/10. This is a math problem.
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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.
22 2/3% of 320 = 0.226667 x 320 = 72.53344
three hundred twenty
128