40% off = 60% 60% of 21 dollars = 21*60/100 = 12.60 dollars
$60 off. $40 still on.
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.
40% off of 58 dollars = 60% of 58 dollars = 58*60/100 = 34.80 dollars.
60% off of 148 dollars = 40% of 148 dollars = 148*40/100 dollars = 59.2 dollars
25
40% off 14 dollars leaves you with 60% of 14 dollars. 60% of 14 dollars = 14*60/100 = 8.40 dollars.
60% off of 166 dollars = 40% left of 166 dollars = 166*40/100 = 66.40 dollars.
40% off 171 dollars = 60% [left] of 171 dollars = 171*60/100 = 102.6 dollars
40% off of 15 dollars = 60 left of 15 dollars = 15*60/100 = 9 dollars.
40% off of 20 dollars = 60% of 20 dollars (100 - 40 = 60) = 20*60/100 = 12 dollars