A fifth of a number or 1/5 of a number is a fractious way of saying 20% (percentage) or .2 (decimal)
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0.20
started with 100
3950
It is one fifth of a gill and that would have been equal to 28.4 millilitres. Nowadays, a quarter (35.5 ml), fifth (28.4 ml) and sixth (23.7 ml) have been replaced by measures of 25 ml and 35 ml.
twenty percent off is one fifth off