-70.12% is the change from 860 to 257
Calculation steps:
[( 257 - 860 ) ÷ 860] x 100 = -70.12%
Formula
Percentage change = [(257 - 860) / 860] x 100
Subtract the new number by the original number
257 - 860 = -603
-603 ÷ 860 = -0.7011627906976744
-0.7011627906976744 x 100 = -70.12%