-80.4% is the change from 500 to 98
Calculation steps:
[( 98 - 500 ) ÷ 500] x 100 = -80.4%
Formula
Percentage change = [(98 - 500) / 500] x 100
Subtract the new number by the original number
98 - 500 = -402
-402 ÷ 500 = -0.804
-0.804 x 100 = -80.4%
Example