2 points
Convert percentage to fraction, i.e, 80% become 0.8
That’s not a fraction.
⅘ is a fraction.
2 points
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You know we say “a fraction of something” with a number(usually between 1 and zero) often denoted by letter epsilon. 4/5 equals 0.8 so there is nothing wrong in calling that a fraction too
Edit: Its called Decimal Fractions