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Anonymous
4 dollars.
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Subtracting 10 percent from 40 dollars gives 40 x (1 - (10/100)) = 36 dollars.
10 percent of 442 dollars is $44.20, so 40% is $176.80 .
40% of $10= 40% * $10= 0.40 * $10= $4
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$36.00