Calculate the % of a numeric field

Hello,
how to calculate the % of a numeric field ?
Thank you.

Well for example:
you have a numeric field called NumericField1
you want to know what is 15% of NumericField1
NumericField1.rawValue * 0.15
if you want to add 15% to NumericField1
NumericField1.rawValue * 1.15
if you want to remove 15% to NumericField1
NumericField1.rawValue * 0.85

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