-70.23% is the change from 860 to 256
Calculation steps:
[( 256 - 860 ) ÷ 860] x 100 = -70.23%
Formula
Percentage change = [(256 - 860) / 860] x 100
Subtract the new number by the original number
256 - 860 = -604
-604 ÷ 860 = -0.7023255813953488
-0.7023255813953488 x 100 = -70.23%