40% decrease.
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1 percent of 54 is 0.54. 60 percent is 60 times 0.54 = 32.4
72/80 x 100 = 90 % 100 - 90 = 10 % which is the decrease from 80 to 72
-30%
It is: (320-32)/320 times 100 = 90% decrease
40% = 0.4 Therefore, 40% off $90= $90 - (0.4 x $90) = $54