-89.61% is the change from 828 to 86
Calculation steps:
[( 86 - 828 ) ÷ 828] x 100 = -89.61%
Formula
Percentage change = [(86 - 828) / 828] x 100
Subtract the new number by the original number
86 - 828 = -742
-742 ÷ 828 = -0.8961352657004831
-0.8961352657004831 x 100 = -89.61%