-83.71% is the change from 491 to 80
Calculation steps:
[( 80 - 491 ) ÷ 491] x 100 = -83.71%
Formula
Percentage change = [(80 - 491) / 491] x 100
Subtract the new number by the original number
80 - 491 = -411
-411 ÷ 491 = -0.8370672097759674
-0.8370672097759674 x 100 = -83.71%