-34.69% is the change from 392 to 256
Calculation steps:
[( 256 - 392 ) ÷ 392] x 100 = -34.69%
Formula
Percentage change = [(256 - 392) / 392] x 100
Subtract the new number by the original number
256 - 392 = -136
-136 ÷ 392 = -0.3469387755102041
-0.3469387755102041 x 100 = -34.69%