-92.97% is the change from 256 to 18
Calculation steps:
[( 18 - 256 ) ÷ 256] x 100 = -92.97%
Formula
Percentage change = [(18 - 256) / 256] x 100
Subtract the new number by the original number
18 - 256 = -238
-238 ÷ 256 = -0.9296875
-0.9296875 x 100 = -92.97%