-40.63% is the change from 256 to 152
Calculation steps:
[( 152 - 256 ) ÷ 256] x 100 = -40.63%
Formula
Percentage change = [(152 - 256) / 256] x 100
Subtract the new number by the original number
152 - 256 = -104
-104 ÷ 256 = -0.40625
-0.40625 x 100 = -40.63%