-87.68% is the change from 690 to 85
Calculation steps:
[( 85 - 690 ) ÷ 690] x 100 = -87.68%
Formula
Percentage change = [(85 - 690) / 690] x 100
Subtract the new number by the original number
85 - 690 = -605
-605 ÷ 690 = -0.8768115942028986
-0.8768115942028986 x 100 = -87.68%