the answer to your question is 80%
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Two fifths, as a fraction, is equivalent to four tenths, which is .4 as a decimal. Two fifths, as a percentage, is 40%.
Four fifths of 20.5 is 16.4.
A fifth of a number or 1/5 of a number is a fractious way of saying 20% (percentage) or .2 (decimal)
One-fifth and four-fifths makes a whole.
The answer is 1