To find 90% of 40, just multiply .90 times 40, which equals 36.
Since 10% of 40 is 4, then 90% of 40 are 4*9=36.
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40% of $90= 40% * 90= 0.4 * 90= $36
Ninety percent
40% = 0.4 Therefore, 40% off $90= $90 - (0.4 x $90) = $54
% rate = 44.44% = 40/90 * 100% = 0.4444 * 100% = 44.44%
40% decrease.