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20% means 20/100 = 1/5

So 20% of $279 is 1/5 x $279 = $55.80

So 20% off $279 is $279 - $55.80 = $223.20

Alternatively, note that 1/5 off a whole is 1 - 1/5 = 4/5, so $279 x 4/5 = $223.20

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15y ago

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