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You should round to two decimal places unless the number is large - like the US national debt, for example.
More than 60 inches square!
You could round it to 20.8, but ultimately, you should round it to 21
It depends on what units are used for the measure of 120. Is it 120 inches, 120 centimetres, etc. Second, in terms of purchasing a length of fabric, it also depends on the width of the fabric.
Round your percentage and that should be it.