40% of $7
= 40% * 7
= 0.4 * 7
= $2.80
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40% off 7 dollars = 60% of 7 dollars = 7*60/100 = 4.20 dollars.
6.75
40% of 500 dollars = 500*40/100 = 200 dollars
40% of 98 dollars is 39.20 dollars
10 percent of 442 dollars is $44.20, so 40% is $176.80 .