-82.69% is the change from 491 to 85
Calculation steps:
[( 85 - 491 ) ÷ 491] x 100 = -82.69%
Formula
Percentage change = [(85 - 491) / 491] x 100
Subtract the new number by the original number
85 - 491 = -406
-406 ÷ 491 = -0.8268839103869654
-0.8268839103869654 x 100 = -82.69%