-72.17% is the change from 920 to 256
Calculation steps:
[( 256 - 920 ) ÷ 920] x 100 = -72.17%
Formula
Percentage change = [(256 - 920) / 920] x 100
Subtract the new number by the original number
256 - 920 = -664
-664 ÷ 920 = -0.7217391304347827
-0.7217391304347827 x 100 = -72.17%