-95.93% is the change from 491 to 20
Calculation steps:
[( 20 - 491 ) ÷ 491] x 100 = -95.93%
Formula
Percentage change = [(20 - 491) / 491] x 100
Subtract the new number by the original number
20 - 491 = -471
-471 ÷ 491 = -0.9592668024439919
-0.9592668024439919 x 100 = -95.93%