-99.09% is the change from 550 to 5
Calculation steps:
[( 5 - 550 ) ÷ 550] x 100 = -99.09%
Formula
Percentage change = [(5 - 550) / 550] x 100
Subtract the new number by the original number
5 - 550 = -545
-545 ÷ 550 = -0.990909090909091
-0.990909090909091 x 100 = -99.09%