-82.48% is the change from 491 to 86
Calculation steps:
[( 86 - 491 ) ÷ 491] x 100 = -82.48%
Formula
Percentage change = [(86 - 491) / 491] x 100
Subtract the new number by the original number
86 - 491 = -405
-405 ÷ 491 = -0.824847250509165
-0.824847250509165 x 100 = -82.48%