-23.92% is the change from 255 to 194
Calculation steps:
[( 194 - 255 ) ÷ 255] x 100 = -23.92%
Formula
Percentage change = [(194 - 255) / 255] x 100
Subtract the new number by the original number
194 - 255 = -61
-61 ÷ 255 = -0.23921568627450981
-0.23921568627450981 x 100 = -23.92%