64.84% is the change from 256 to 422
Calculation steps:
[( 422 - 256 ) ÷ 256] x 100 = 64.84%
Formula
Percentage change = [(422 - 256) / 256] x 100
Subtract the new number by the original number
422 - 256 = 166
166 ÷ 256 = 0.6484375
0.6484375 x 100 = 64.84%