By leaving it as it is because 2.85 is already a rational number
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2.85 is rational. (It can be written as fraction: 285/100)
Any fraction is a rational number and by dividing its denominator into its numerator will produce a decimal number as for example 3/4 = 0.75
285% of 600 = 600*285/100 = 1710
No, it is rational.
Any number, rational or irrational, can be divided by 1 and itself. A number divided by 1 does not change, and a number divided by itself is equal to 1. The definition of a rational number is a number which can be expressed as the ratio of two integers. So there is division involved, but not the kind you thought.