-20% is the change from 860 to 688
Calculation steps:
[( 688 - 860 ) ÷ 860] x 100 = -20%
Formula
Percentage change = [(688 - 860) / 860] x 100
Subtract the new number by the original number
688 - 860 = -172
-172 ÷ 860 = -0.2
-0.2 x 100 = -20%
Example