-89.38% is the change from 810 to 86
Calculation steps:
[( 86 - 810 ) ÷ 810] x 100 = -89.38%
Formula
Percentage change = [(86 - 810) / 810] x 100
Subtract the new number by the original number
86 - 810 = -724
-724 ÷ 810 = -0.8938271604938272
-0.8938271604938272 x 100 = -89.38%