-80% is the change from 860 to 172
Calculation steps:
[( 172 - 860 ) ÷ 860] x 100 = -80%
Formula
Percentage change = [(172 - 860) / 860] x 100
Subtract the new number by the original number
172 - 860 = -688
-688 ÷ 860 = -0.8
-0.8 x 100 = -80%
Example