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0.4 * 105 = 42.
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40% off = 60% So 60% of 105 dollars = 105*60/100 = 63 dollars.
Subtracting 40 percent from 105 gives 105 x (1 - (40/100)) = 105 x 0.6 = 63
divide 105 by 10 = 10.5
105 x .42 = 44.1
40% of 105 = 42