Subtracting ten percent from an amount is the same as multiplying the original number by 0.9. In this instance: $120 x 0.9 = $108.
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If something costs 120 and you get 10 percent off, you would save 12 dollars. Therefore, the item would cost 108 dollars after the discount.
120 x .20= 24 $24 dollars off $120= $96
40% off of 120 = 72 = 40% discount applied to 120 = 120 - (40% * 120) = 120 - (0.40 * 120) = 120 - 48 = 72
120
120
Subtracting 20 percent from 120 gives 120 x (1 - (20/100)) = 120 x 0.8 = 96