-86.88% is the change from 648 to 85
Calculation steps:
[( 85 - 648 ) ÷ 648] x 100 = -86.88%
Formula
Percentage change = [(85 - 648) / 648] x 100
Subtract the new number by the original number
85 - 648 = -563
-563 ÷ 648 = -0.8688271604938271
-0.8688271604938271 x 100 = -86.88%