To express four-fifths as a percent, you can follow these steps:
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Convert the fraction to a decimal by dividing the numerator by the denominator: \[ \frac{4}{5} = 0.8 \]
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Multiply the decimal by 100 to convert it to a percent: \[ 0.8 \times 100 = 80 \]
So, four-fifths is \( 80% \).