The amount after the discount is $40.00
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40% off = 60% 60% of 21 dollars = 21*60/100 = 12.60 dollars
40% off 37 dollars = 60% of 37 dollars = 37*60/100 = 22.20 dollars
40% off 7 dollars = 60% of 7 dollars = 7*60/100 = 4.20 dollars.
60% off of 148 dollars = 40% of 148 dollars = 148*40/100 dollars = 59.2 dollars
40% off 171 dollars = 60% [left] of 171 dollars = 171*60/100 = 102.6 dollars