-82.4% is the change from 500 to 88
Calculation steps:
[( 88 - 500 ) ÷ 500] x 100 = -82.4%
Formula
Percentage change = [(88 - 500) / 500] x 100
Subtract the new number by the original number
88 - 500 = -412
-412 ÷ 500 = -0.824
-0.824 x 100 = -82.4%
Example