-68.6% is the change from 860 to 270
Calculation steps:
[( 270 - 860 ) ÷ 860] x 100 = -68.6%
Formula
Percentage change = [(270 - 860) / 860] x 100
Subtract the new number by the original number
270 - 860 = -590
-590 ÷ 860 = -0.686046511627907
-0.686046511627907 x 100 = -68.6%