-96.55% is the change from 550 to 19
Calculation steps:
[( 19 - 550 ) ÷ 550] x 100 = -96.55%
Formula
Percentage change = [(19 - 550) / 550] x 100
Subtract the new number by the original number
19 - 550 = -531
-531 ÷ 550 = -0.9654545454545455
-0.9654545454545455 x 100 = -96.55%