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If 45 = 120% then simply divide 45 by 120, to find 1%, which is 0.375 and then multiply this by 80 to find 80%, which is 30

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1.20X = 45; X = 45/1.20 = 37.5; then 80% of the number is: 37.5 X .80 = 30

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14y ago

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