-81.6% is the change from 500 to 92
Calculation steps:
[( 92 - 500 ) ÷ 500] x 100 = -81.6%
Formula
Percentage change = [(92 - 500) / 500] x 100
Subtract the new number by the original number
92 - 500 = -408
-408 ÷ 500 = -0.816
-0.816 x 100 = -81.6%
Example