-17.97% is the change from 256 to 210
Calculation steps:
[( 210 - 256 ) ÷ 256] x 100 = -17.97%
Formula
Percentage change = [(210 - 256) / 256] x 100
Subtract the new number by the original number
210 - 256 = -46
-46 ÷ 256 = -0.1796875
-0.1796875 x 100 = -17.97%