-50.06% is the change from 855 to 427
Calculation steps:
[( 427 - 855 ) ÷ 855] x 100 = -50.06%
Formula
Percentage change = [(427 - 855) / 855] x 100
Subtract the new number by the original number
427 - 855 = -428
-428 ÷ 855 = -0.5005847953216375
-0.5005847953216375 x 100 = -50.06%