-86.61% is the change from 635 to 85
Calculation steps:
[( 85 - 635 ) ÷ 635] x 100 = -86.61%
Formula
Percentage change = [(85 - 635) / 635] x 100
Subtract the new number by the original number
85 - 635 = -550
-550 ÷ 635 = -0.8661417322834646
-0.8661417322834646 x 100 = -86.61%