-96.2% is the change from 500 to 19
Calculation steps:
[( 19 - 500 ) ÷ 500] x 100 = -96.2%
Formula
Percentage change = [(19 - 500) / 500] x 100
Subtract the new number by the original number
19 - 500 = -481
-481 ÷ 500 = -0.962
-0.962 x 100 = -96.2%
Example