42/30 = 1.4 = 140 %
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42 - 30% = 42 x (1 - (30/100)) = 42 x 0.7 = 29.4
30% off of 42 = 70% of 42 = 42*70/100 = 29.40
42- you figure this out by changing the percent into a decimal and multiplying it. 0.3 x 140=42
42 is thirty percent of 140.
42