40% off = 60% 60% of 21 dollars = 21*60/100 = 12.60 dollars
40% off 7 dollars = 60% of 7 dollars = 7*60/100 = 4.20 dollars.
40% off 37 dollars = 60% of 37 dollars = 37*60/100 = 22.20 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
40% off = 60% 60% of 21 dollars = 21*60/100 = 12.60 dollars
40% off of 20 dollars = 60% of 20 dollars (100 - 40 = 60) = 20*60/100 = 12 dollars
40% off 7 dollars = 60% of 7 dollars = 7*60/100 = 4.20 dollars.
40% off 37 dollars = 60% of 37 dollars = 37*60/100 = 22.20 dollars
60% off of 148 dollars = 40% of 148 dollars = 148*40/100 dollars = 59.2 dollars
40% off 14 dollars leaves you with 60% of 14 dollars. 60% of 14 dollars = 14*60/100 = 8.40 dollars.
40% off 171 dollars = 60% [left] of 171 dollars = 171*60/100 = 102.6 dollars
60% off of 166 dollars = 40% left of 166 dollars = 166*40/100 = 66.40 dollars.
80 * 75/100 = 60 dollars
40% off 100 dollars is 40 dollars. That means if something is priced at 100 dollars, you need pay only 60 dollars
20 dollars are 100 percent. You want 40 percent off, that means you want 60 percent. 20/100 = 0.2 is 1 percent that value times 60 gives the wanted 60 percent. You have to pay only 0.2 times 60 = 12 dollars instead of 20 dollars.
40% off of 54 dollars = 60% of 54 dollars = 54*60/100 = 32.40 dollars