-39.34% is the change from 422 to 256
Calculation steps:
[( 256 - 422 ) ÷ 422] x 100 = -39.34%
Formula
Percentage change = [(256 - 422) / 422] x 100
Subtract the new number by the original number
256 - 422 = -166
-166 ÷ 422 = -0.3933649289099526
-0.3933649289099526 x 100 = -39.34%