-70.68% is the change from 873 to 256
Calculation steps:
[( 256 - 873 ) ÷ 873] x 100 = -70.68%
Formula
Percentage change = [(256 - 873) / 873] x 100
Subtract the new number by the original number
256 - 873 = -617
-617 ÷ 873 = -0.7067583046964491
-0.7067583046964491 x 100 = -70.68%