-86.07% is the change from 610 to 85
Calculation steps:
[( 85 - 610 ) ÷ 610] x 100 = -86.07%
Formula
Percentage change = [(85 - 610) / 610] x 100
Subtract the new number by the original number
85 - 610 = -525
-525 ÷ 610 = -0.860655737704918
-0.860655737704918 x 100 = -86.07%