-92.91% is the change from 550 to 39
Calculation steps:
[( 39 - 550 ) ÷ 550] x 100 = -92.91%
Formula
Percentage change = [(39 - 550) / 550] x 100
Subtract the new number by the original number
39 - 550 = -511
-511 ÷ 550 = -0.9290909090909091
-0.9290909090909091 x 100 = -92.91%