-73.44% is the change from 256 to 68
Calculation steps:
[( 68 - 256 ) ÷ 256] x 100 = -73.44%
Formula
Percentage change = [(68 - 256) / 256] x 100
Subtract the new number by the original number
68 - 256 = -188
-188 ÷ 256 = -0.734375
-0.734375 x 100 = -73.44%