-83.97% is the change from 499 to 80
Calculation steps:
[( 80 - 499 ) ÷ 499] x 100 = -83.97%
Formula
Percentage change = [(80 - 499) / 499] x 100
Subtract the new number by the original number
80 - 499 = -419
-419 ÷ 499 = -0.8396793587174348
-0.8396793587174348 x 100 = -83.97%